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YouTube 超快聊天

YouTube直播聊天的终极性能提升

目前为 2023-08-14 提交的版本。查看 最新版本。

  1. // ==UserScript==
  2. // @name                YouTube Super Fast Chat
  3. // @version             0.20.6
  4. // @license             MIT
  5. // @name:ja             YouTube スーパーファーストチャット
  6. // @name:zh-TW          YouTube 超快聊天
  7. // @name:zh-CN          YouTube 超快聊天
  8. // @icon                https://github.com/cyfung1031/userscript-supports/raw/main/icons/super-fast-chat.png
  9. // @namespace           UserScript
  10. // @match               https://www.youtube.com/live_chat*
  11. // @match               https://www.youtube.com/live_chat_replay*
  12. // @author              CY Fung
  13. // @run-at              document-start
  14. // @grant               none
  15. // @unwrap
  16. // @allFrames           true
  17. // @inject-into         page
  18. //
  19. // @compatible          firefox Violentmonkey
  20. // @compatible          firefox Tampermonkey
  21. // @compatible          firefox FireMonkey
  22. // @compatible          chrome Violentmonkey
  23. // @compatible          chrome Tampermonkey
  24. // @compatible          opera Violentmonkey
  25. // @compatible          opera Tampermonkey
  26. // @compatible          safari Stay
  27. // @compatible          edge Violentmonkey
  28. // @compatible          edge Tampermonkey
  29. // @compatible          brave Violentmonkey
  30. // @compatible          brave Tampermonkey
  31. //
  32. // @description         Ultimate Performance Boost for YouTube Live Chats
  33. // @description:ja      YouTubeのライブチャットの究極のパフォーマンスブースト
  34. // @description:zh-TW   YouTube直播聊天的終極性能提升
  35. // @description:zh-CN   YouTube直播聊天的终极性能提升
  36. //
  37. // ==/UserScript==
  38.  
  39. ((__CONTEXT__) => {
  40.   'use strict';
  41.  
  42.   const ENABLE_REDUCED_MAXITEMS_FOR_FLUSH = true;         // TRUE to enable trimming down to 25 messages when there are too many unrendered messages
  43.   const MAX_ITEMS_FOR_TOTAL_DISPLAY = 90;                 // By default, 250 latest messages will be displayed, but displaying 90 messages is already sufficient.
  44.   const MAX_ITEMS_FOR_FULL_FLUSH = 25;                    // If there are too many new (stacked) messages not yet rendered, clean all and flush 25 latest messages then incrementally added back to 90 messages
  45.  
  46.   const ENABLE_NO_SMOOTH_TRANSFORM = true;                // Depends on whether you want the animation effect for new chat messages
  47.   const USE_OPTIMIZED_ON_SCROLL_ITEMS = true;             // TRUE for the majority
  48.   const USE_WILL_CHANGE_CONTROLLER = false;               // FALSE for the majority
  49.   const ENABLE_FULL_RENDER_REQUIRED_PREFERRED = true;     // In Chrome, the rendering of new chat messages could be too fast for no smooth transform. 80ms delay of displaying new messages should be sufficient for element rendering.
  50.   const ENABLE_OVERFLOW_ANCHOR_PREFERRED = true;          // Enable `overflow-anchor: auto` to lock the scroll list at the bottom for no smooth transform.
  51.  
  52.   const FIX_SHOW_MORE_BUTTON_LOCATION = true;             // When there are voting options (bottom panel), move the "show more" button to the top.
  53.   const FIX_INPUT_PANEL_OVERFLOW_ISSUE = true;            // When the super chat button is flicking with color, the scrollbar might come out.
  54.   const FIX_INPUT_PANEL_BORDER_ISSUE = true;              // No border should be allowed if there is an empty input panel.
  55.   const SET_CONTAIN_FOR_CHATROOM = true;                  // Rendering hacks (`contain`) for chatroom elements. [ General ]
  56.  
  57.   const FORCE_CONTENT_VISIBILITY_UNSET = true;            // Content-visibility should be always VISIBLE for high performance and great rendering.
  58.   const FORCE_WILL_CHANGE_UNSET = true;                   // Will-change should be always UNSET (auto) for high performance and low energy impact.
  59.  
  60.   // Replace requestAnimationFrame timers with custom implementation
  61.   const ENABLE_RAF_HACK_TICKERS = true;         // When there is a ticker
  62.   const ENABLE_RAF_HACK_DOCKED_MESSAGE = true;  // To be confirmed
  63.   const ENABLE_RAF_HACK_INPUT_RENDERER = true;  // To be confirmed
  64.   const ENABLE_RAF_HACK_EMOJI_PICKER = true;    // When changing the page of the emoji picker
  65.  
  66.   // Force rendering all the character subsets of the designated font(s) before messages come (Pre-Rendering of Text)
  67.   const ENABLE_FONT_PRE_RENDERING_PREFERRED = 1 | 2 | 4 | 8 | 16;
  68.  
  69.   // Backdrop `filter: blur(4px)` inside the iframe can extend to the whole page, causing a negative visual impact on the video you are watching.
  70.   const NO_BACKDROP_FILTER_WHEN_MENU_SHOWN = true;
  71.  
  72.   // Data Manipulation for Participants (Participant List)
  73.   const DO_PARTICIPANT_LIST_HACKS = true;                     // TRUE for the majority
  74.   const SHOW_PARTICIPANT_CHANGES_IN_CONSOLE = false;          // Just too annoying to show them all in popular chat
  75.   const CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = true;  // Only consider changes in renderable content (not concerned with the last chat message of the participants)
  76.   const PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED = true;
  77.  
  78.   const ENABLE_SHOW_MORE_BLINKER = true;                      // BLINK WHEN NEW MESSAGES COME
  79.  
  80.   const ENABLE_FLAGS_MAINTAIN_STABLE_LIST = true;             // faster stampDomArray_ for participants list creation
  81.   const ENABLE_FLAGS_REUSE_COMPONENTS = true;
  82.  
  83.   const { IntersectionObserver } = __CONTEXT__;
  84.  
  85.   /** @type {globalThis.PromiseConstructor} */
  86.   const Promise = (async () => { })().constructor; // YouTube hacks Promise in WaterFox Classic and "Promise.resolve(0)" nevers resolve.
  87.  
  88.   if (!IntersectionObserver) return console.warn("Your browser does not support IntersectionObserver.\nPlease upgrade to the latest version.")
  89.  
  90.   // necessity of cssText3_smooth_transform_position to be checked.
  91.   const cssText3_smooth_transform_position = ENABLE_NO_SMOOTH_TRANSFORM ? `
  92.  
  93.     #item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer {
  94.         position: static !important;
  95.     }
  96.  
  97.   `: '';
  98.  
  99.   // fallback if dummy style fn fails
  100.   const cssText4_smooth_transform_forced_props = ENABLE_NO_SMOOTH_TRANSFORM ? `
  101.  
  102.     /* optional */
  103.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  104.         height: auto !important;
  105.         min-height: unset !important;
  106.     }
  107.  
  108.     #items.style-scope.yt-live-chat-item-list-renderer {
  109.         transform: translateY(0px) !important;
  110.     }
  111.  
  112.     /* optional */
  113.  
  114.   `: '';
  115.  
  116.   const cssText5 = SET_CONTAIN_FOR_CHATROOM ? `
  117.  
  118.     /* ------------------------------------------------------------------------------------------------------------- */
  119.  
  120.     yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer #image, yt-live-chat-author-chip #chat-badges.yt-live-chat-author-chip yt-live-chat-author-badge-renderer #image img {
  121.         contain: layout style;
  122.     }
  123.  
  124.     #items.style-scope.yt-live-chat-item-list-renderer {
  125.         contain: layout paint style;
  126.     }
  127.  
  128.     #item-offset.style-scope.yt-live-chat-item-list-renderer {
  129.         contain: style;
  130.     }
  131.  
  132.     #item-scroller.style-scope.yt-live-chat-item-list-renderer {
  133.         contain: size style;
  134.     }
  135.  
  136.     #contents.style-scope.yt-live-chat-item-list-renderer, #chat.style-scope.yt-live-chat-renderer, img.style-scope.yt-img-shadow[width][height] {
  137.         contain: size layout paint style;
  138.     }
  139.  
  140.     .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label], .style-scope.yt-live-chat-ticker-renderer[role="button"][aria-label] > #container {
  141.         contain: layout paint style;
  142.     }
  143.  
  144.     yt-live-chat-text-message-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-membership-item-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-paid-message-renderer.style-scope.yt-live-chat-item-list-renderer, yt-live-chat-banner-manager.style-scope.yt-live-chat-item-list-renderer {
  145.         contain: layout style;
  146.     }
  147.  
  148.     tp-yt-paper-tooltip[style*="inset"][role="tooltip"] {
  149.         contain: layout paint style;
  150.     }
  151.  
  152.     /* ------------------------------------------------------------------------------------------------------------- */
  153.  
  154.   ` : '';
  155.  
  156.   const cssText6b_show_more_button = FIX_SHOW_MORE_BUTTON_LOCATION ? `
  157.  
  158.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer{
  159.         top: 4px;
  160.         transition-property: top;
  161.         bottom: unset;
  162.     }
  163.  
  164.     yt-live-chat-renderer[has-action-panel-renderer] #show-more.yt-live-chat-item-list-renderer[disabled]{
  165.         top: -42px;
  166.     }
  167.  
  168.   `: '';
  169.  
  170.   const cssText6c_input_panel_overflow = FIX_INPUT_PANEL_OVERFLOW_ISSUE ? `
  171.  
  172.     #input-panel #picker-buttons yt-live-chat-icon-toggle-button-renderer#product-picker {
  173.         contain: layout style;
  174.     }
  175.  
  176.     #chat.yt-live-chat-renderer ~ #panel-pages.yt-live-chat-renderer {
  177.         overflow: visible;
  178.     }
  179.  
  180.   `: '';
  181.  
  182.   const cssText6d_input_panel_border = FIX_INPUT_PANEL_BORDER_ISSUE ? `
  183.  
  184.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer:not(:empty) {
  185.         --yt-live-chat-action-panel-top-border: none;
  186.     }
  187.  
  188.     html #panel-pages.yt-live-chat-renderer > #input-panel.yt-live-chat-renderer.iron-selected > *:first-child {
  189.         border-top: 1px solid var(--yt-live-chat-panel-pages-border-color);
  190.     }
  191.  
  192.     html #panel-pages.yt-live-chat-renderer {
  193.         border-top: 0;
  194.         border-bottom: 0;
  195.     }
  196.  
  197.   `: '';
  198.  
  199.   const cssText7b_content_visibility_unset = FORCE_CONTENT_VISIBILITY_UNSET ? `
  200.  
  201.     img,
  202.     yt-img-shadow[height][width],
  203.     yt-img-shadow {
  204.         content-visibility: visible !important;
  205.     }
  206.  
  207.   `  : '';
  208.  
  209.   const cssText7c_will_change_unset = FORCE_WILL_CHANGE_UNSET ? `
  210.  
  211.     /* remove YouTube constant will-change */
  212.     /* constant value will slow down the performance; default auto */
  213.  
  214.     /* www-player.css */
  215.     html .ytp-contextmenu,
  216.     html .ytp-settings-menu {
  217.         will-change: unset;
  218.     }
  219.  
  220.     /* frequently matched elements */
  221.     html .fill.yt-interaction,
  222.     html .stroke.yt-interaction,
  223.     html .yt-spec-touch-feedback-shape__fill,
  224.     html .yt-spec-touch-feedback-shape__stroke {
  225.         will-change: unset;
  226.     }
  227.  
  228.     /* live_chat_polymer.js */
  229.     /*
  230.     html .toggle-button.tp-yt-paper-toggle-button,
  231.     html #primaryProgress.tp-yt-paper-progress,
  232.     html #secondaryProgress.tp-yt-paper-progress,
  233.     html #onRadio.tp-yt-paper-radio-button,
  234.     html .fill.yt-interaction,
  235.     html .stroke.yt-interaction,
  236.     html .yt-spec-touch-feedback-shape__fill,
  237.     html .yt-spec-touch-feedback-shape__stroke {
  238.         will-change: unset;
  239.     }
  240.     */
  241.  
  242.     /* desktop_polymer_enable_wil_icons.js */
  243.     /* html .fill.yt-interaction,
  244.     html .stroke.yt-interaction, */
  245.     html tp-yt-app-header::before,
  246.     html tp-yt-iron-list,
  247.     html #items.tp-yt-iron-list > *,
  248.     html #onRadio.tp-yt-paper-radio-button,
  249.     html .toggle-button.tp-yt-paper-toggle-button,
  250.     html ytd-thumbnail-overlay-toggle-button-renderer[use-expandable-tooltip] #label.ytd-thumbnail-overlay-toggle-button-renderer,
  251.     html #items.ytd-post-multi-image-renderer,
  252.     html #items.ytd-horizontal-card-list-renderer,
  253.     html #items.yt-horizontal-list-renderer,
  254.     html #left-arrow.yt-horizontal-list-renderer,
  255.     html #right-arrow.yt-horizontal-list-renderer,
  256.     html #items.ytd-video-description-infocards-section-renderer,
  257.     html #items.ytd-video-description-music-section-renderer,
  258.     html #chips.ytd-feed-filter-chip-bar-renderer,
  259.     html #chips.yt-chip-cloud-renderer,
  260.     html #items.ytd-merch-shelf-renderer,
  261.     html #items.ytd-product-details-image-carousel-renderer,
  262.     html ytd-video-preview,
  263.     html #player-container.ytd-video-preview,
  264.     html #primaryProgress.tp-yt-paper-progress,
  265.     html #secondaryProgress.tp-yt-paper-progress,
  266.     html ytd-miniplayer[enabled] /* ,
  267.     html .yt-spec-touch-feedback-shape__fill,
  268.     html .yt-spec-touch-feedback-shape__stroke */ {
  269.         will-change: unset;
  270.     }
  271.  
  272.     /* other */
  273.     .ytp-videowall-still-info-content[class],
  274.     .ytp-suggestion-image[class] {
  275.         will-change: unset !important;
  276.     }
  277.  
  278.   ` : '';
  279.  
  280.   const ENABLE_FONT_PRE_RENDERING = typeof HTMLElement.prototype.append === 'function' ? (ENABLE_FONT_PRE_RENDERING_PREFERRED || 0) : 0;
  281.   const cssText8_fonts_pre_render = ENABLE_FONT_PRE_RENDERING ? `
  282.  
  283.     elzm-fonts {
  284.         visibility: collapse;
  285.         position: fixed;
  286.         top: -10px;
  287.         left: -10px;
  288.         font-size: 10pt;
  289.         line-height: 100%;
  290.         width: 100px;
  291.         height: 100px;
  292.         transform: scale(0.1);
  293.         transform: scale(0.01);
  294.         transform: scale(0.001);
  295.         transform-origin: 0 0;
  296.         contain: strict;
  297.         display: block;
  298.  
  299.         user-select: none !important;
  300.         pointer-events: none !important;
  301.     }
  302.  
  303.     elzm-fonts[id]#elzm-fonts-yk75g {
  304.         user-select: none !important;
  305.         pointer-events: none !important;
  306.     }
  307.  
  308.     elzm-font {
  309.         visibility: collapse;
  310.         position: absolute;
  311.         line-height: 100%;
  312.         width: 100px;
  313.         height: 100px;
  314.         contain: strict;
  315.         display: block;
  316.  
  317.         user-select: none !important;
  318.         pointer-events: none !important;
  319.     }
  320.  
  321.     elzm-font::before {
  322.         visibility: collapse;
  323.         position: absolute;
  324.         line-height: 100%;
  325.         width: 100px;
  326.         height: 100px;
  327.         contain: strict;
  328.         display: block;
  329.  
  330.         content: '0aZ!@#$~^&*()_-+[]{}|;:><?\\0460\\0301\\0900\\1F00\\0370\\0102\\0100\\28EB2\\28189\\26DA0\\25A9C\\249BB\\23F61\\22E8B\\21927\\21076\\2048E\\1F6F5\\FF37\\F94F\\F0B2\\9F27\\9D9A\\9BEA\\9A6B\\98EC\\9798\\9602\\949D\\9370\\926B\\913A\\8FA9\\8E39\\8CC1\\8B26\\8983\\8804\\8696\\8511\\83BC\\828D\\8115\\7F9A\\7E5B\\7D07\\7B91\\7A2C\\78D2\\776C\\7601\\74AA\\73B9\\7265\\70FE\\6FBC\\6E88\\6D64\\6C3F\\6A9C\\6957\\67FE\\66B3\\6535\\63F2\\628E\\612F\\5FE7\\5E6C\\5CEE\\5B6D\\5A33\\58BC\\575B\\5611\\54BF\\536E\\51D0\\505D\\4F22\\4AD1\\41DB\\3B95\\3572\\2F3F\\26FD\\25A1\\2477\\208D\\1D0A\\1FB\\A1\\A3\\B4\\2CB\\60\\10C\\E22\\A5\\4E08\\B0\\627\\2500\\5E\\201C\\3C\\B7\\23\\26\\3E\\D\\20\\25EE8\\1F235\\FFD7\\FA10\\F92D\\9E8B\\9C3E\\9AE5\\98EB\\971D\\944A\\92BC\\9143\\8F52\\8DC0\\8B2D\\8973\\87E2\\8655\\84B4\\82E8\\814A\\7F77\\7D57\\7BC8\\7A17\\7851\\768C\\7511\\736C\\7166\\6F58\\6D7C\\6B85\\69DD\\6855\\667E\\64D2\\62CF\\6117\\5F6C\\5D9B\\5BBC\\598B\\57B3\\5616\\543F\\528D\\50DD\\4F57\\4093\\3395\\32B5\\31C8\\3028\\2F14\\25E4\\24D1\\2105\\2227\\A8\\2D9\\2CA\\2467\\B1\\2020\\2466\\251C\\266B\\AF\\4E91\\221E\\2464\\2266\\2207\\4E32\\25B3\\2463\\2010\\2103\\3014\\25C7\\24\\25BD\\4E18\\2460\\21D2\\2015\\2193\\4E03\\7E\\25CB\\2191\\25BC\\3D\\500D\\4E01\\25\\30F6\\2605\\266A\\40\\2B\\4E16\\7C\\A9\\4E\\21\\1F1E9\\FEE3\\F0A7\\9F3D\\9DFA\\9C3B\\9A5F\\98C8\\972A\\95B9\\94E7\\9410\\92B7\\914C\\8FE2\\8E2D\\8CAF\\8B5E\\8A02\\8869\\86E4\\8532\\83B4\\82A9\\814D\\7FFA\\7ED7\\7DC4\\7CCC\\7BC3\\7ACA\\797C\\783E\\770F\\760A\\74EF\\73E7\\72DD\\719C\\7005\\6ED8\\6DC3\\6CB2\\6A01\\68E1\\6792\\663A\\64F8\\63BC\\623B\\60FA\\5FD1\\5EA3\\5D32\\5BF5\\5AB2\\5981\\5831\\570A\\5605\\5519\\53FB\\52A2\\5110\\4FE3\\4EB8\\3127\\279C\\2650\\254B\\23E9\\207B\\1D34\\2AE\\176\\221A\\161\\200B\\300C\\4E4C\\1F921\\FF78\\FA0A\\F78A\\9EB9\\9D34\\9BD3\\9A6F\\9912\\97C6\\964E\\950C\\93E4\\92E5\\91F0\\90BB\\8F68\\8E18\\8B6C\\89F6\\889B\\874C\\8602\\84B1\\8378\\826E\\8113\\7FB1\\7EAF\\7D89\\7C20\\7AFB\\7988\\7840\\7705\\75CC\\749A\\73B3\\727F\\7113\\6FE8\\6ED6\\6DD3\\6CDA\\6BBB\\6A31\\6900\\67D9\\66A7\\655D\\6427\\630D\\61C6\\60AC\\5F78\\5E34\\5CE0\\5B80\\5A51\\590B\\57A1\\566F\\5551\\543D\\52DB\\518F\\5032\\3A17\\305C\\2749\\264A\\2567\\2476\\2139\\1EC0\\11AF\\2C8\\1AF\\E17\\2190\\2022\\2502\\2312\\2025\\50';
  331.  
  332.         user-select: none !important;
  333.         pointer-events: none !important;
  334.     }
  335.  
  336.   `: '';
  337.  
  338.   const cssText9_no_backdrop_filter_when_menu_shown = NO_BACKDROP_FILTER_WHEN_MENU_SHOWN ? `
  339.     tp-yt-iron-dropdown.yt-live-chat-app ytd-menu-popup-renderer  {
  340.         -webkit-backdrop-filter: none;
  341.         backdrop-filter: none;
  342.     }
  343.   `: '';
  344.  
  345.   const cssText10_show_more_blinker = ENABLE_SHOW_MORE_BLINKER ? `
  346.  
  347.     @keyframes blinker-miuzp {
  348.         0%, 60%, 100% {
  349.             opacity: 1;
  350.         }
  351.         30% {
  352.             opacity: 0.6;
  353.         }
  354.     }
  355.  
  356.     yt-icon-button#show-more.has-new-messages-miuzp {
  357.         animation: blinker-miuzp 1.74s linear infinite;      
  358.     }
  359.  
  360.   `: '';
  361.  
  362.  
  363.   const addCss = () => `
  364.  
  365.   ${cssText8_fonts_pre_render}
  366.  
  367.   ${cssText9_no_backdrop_filter_when_menu_shown}
  368.  
  369.   @supports (contain: layout paint style) {
  370.  
  371.     ${cssText5}
  372.  
  373.   }
  374.  
  375.   @supports (color: var(--general)) {
  376.  
  377.     html {
  378.         --yt-live-chat-item-list-renderer-padding: 0px 0px;
  379.     }
  380.  
  381.     ${cssText3_smooth_transform_position}
  382.  
  383.     ${cssText7c_will_change_unset}
  384.  
  385.     ${cssText7b_content_visibility_unset}
  386.  
  387.     yt-live-chat-item-list-renderer:not([allow-scroll]) #item-scroller.yt-live-chat-item-list-renderer {
  388.         overflow-y: scroll;
  389.         padding-right: 0;
  390.     }
  391.  
  392.     ${cssText4_smooth_transform_forced_props}
  393.  
  394.     yt-icon[icon="down_arrow"] > *, yt-icon-button#show-more > * {
  395.         pointer-events: none !important;
  396.     }
  397.  
  398.     #continuations, #continuations * {
  399.         contain: strict;
  400.         position: fixed;
  401.         top: 2px;
  402.         height: 1px;
  403.         width: 2px;
  404.         height: 1px;
  405.         visibility: collapse;
  406.     }
  407.  
  408.     ${cssText6b_show_more_button}
  409.  
  410.     ${cssText6d_input_panel_border}
  411.  
  412.     ${cssText6c_input_panel_overflow}
  413.  
  414.   }
  415.  
  416.  
  417.   @supports (overflow-anchor: auto) {
  418.  
  419.     .no-anchor * {
  420.         overflow-anchor: none;
  421.     }
  422.     .no-anchor > item-anchor {
  423.         overflow-anchor: auto;
  424.     }
  425.  
  426.     item-anchor {
  427.  
  428.         height:1px;
  429.         width: 100%;
  430.         transform: scaleY(0.00001);
  431.         transform-origin:0 0;
  432.         contain: strict;
  433.         opacity:0;
  434.         display:flex;
  435.         position:relative;
  436.         flex-shrink:0;
  437.         flex-grow:0;
  438.         margin-bottom:0;
  439.         overflow:hidden;
  440.         box-sizing:border-box;
  441.         visibility: visible;
  442.         content-visibility: visible;
  443.         contain-intrinsic-size: auto 1px;
  444.         pointer-events:none !important;
  445.  
  446.     }
  447.  
  448.     #item-scroller.style-scope.yt-live-chat-item-list-renderer[class] {
  449.         overflow-anchor: initial !important; /* whenever ENABLE_OVERFLOW_ANCHOR or not */
  450.     }
  451.  
  452.     html item-anchor {
  453.  
  454.         height: 1px;
  455.         width: 1px;
  456.         top: auto;
  457.         left: auto;
  458.         right: auto;
  459.         bottom: auto;
  460.         transform: translateY(-1px);
  461.         position: absolute;
  462.         z-index: -1;
  463.  
  464.     }
  465.  
  466.   }
  467.  
  468.   @supports (color: var(--pre-rendering)) {
  469.  
  470.     @keyframes dontRenderAnimation {
  471.         0% {
  472.             background-position-x: 3px;
  473.         }
  474.         100% {
  475.             background-position-x: 4px;
  476.         }
  477.     }
  478.  
  479.     .dont-render {
  480.  
  481.         visibility: collapse !important;
  482.         transform: scale(0.01) !important;
  483.         transform: scale(0.00001) !important;
  484.         transform: scale(0.0000001) !important;
  485.         transform-origin: 0 0 !important;
  486.         z-index:-1 !important;
  487.         contain: strict !important;
  488.         box-sizing: border-box !important;
  489.  
  490.         height: 1px !important;
  491.         height: 0.1px !important;
  492.         height: 0.01px !important;
  493.         height: 0.0001px !important;
  494.         height: 0.000001px !important;
  495.  
  496.         animation: dontRenderAnimation 1ms linear 80ms 1 normal forwards !important;
  497.  
  498.     }
  499.  
  500.   }
  501.  
  502.   ${cssText10_show_more_blinker}
  503.  
  504.   `;
  505.  
  506.  
  507.   const win = typeof unsafeWindow !== 'undefined' ? unsafeWindow : (this instanceof Window ? this : window);
  508.  
  509.   // Create a unique key for the script and check if it is already running
  510.   const hkey_script = 'mchbwnoasqph';
  511.   if (win[hkey_script]) throw new Error('Duplicated Userscript Calling'); // avoid duplicated scripting
  512.   win[hkey_script] = true;
  513.  
  514.  
  515.   function dr(s) {
  516.     // reserved for future use
  517.     return s;
  518.     // return window.deWeakJS ? window.deWeakJS(s) : s;
  519.   }
  520.  
  521.   const getProto = (element) => {
  522.     if (element) {
  523.       const cnt = element.inst || element;
  524.       return cnt.constructor.prototype || null;
  525.     }
  526.     return null;
  527.   }
  528.  
  529.   const assertor = (f) => f() || console.assert(false, f + "");
  530.  
  531.   const fnIntegrity = (f, d) => {
  532.     if (!f || typeof f !== 'function') {
  533.       console.warn('f is not a function', f);
  534.       return;
  535.     }
  536.     let p = f + "", s = 0, j = -1, w = 0;
  537.     for (let i = 0, l = p.length; i < l; i++) {
  538.       const t = p[i];
  539.       if (((t >= 'a' && t <= 'z') || (t >= 'A' && t <= 'Z'))) {
  540.         if (j < i - 1) w++;
  541.         j = i;
  542.       } else {
  543.         s++;
  544.       }
  545.     }
  546.     let itz = `${f.length}.${s}.${w}`;
  547.     if (!d) {
  548.       console.log(itz);
  549.       return null;
  550.     } else {
  551.       return itz === d;
  552.     }
  553.   }
  554.  
  555.  
  556.   console.assert(MAX_ITEMS_FOR_TOTAL_DISPLAY > 0 && MAX_ITEMS_FOR_FULL_FLUSH > 0 && MAX_ITEMS_FOR_TOTAL_DISPLAY > MAX_ITEMS_FOR_FULL_FLUSH)
  557.  
  558.   let ENABLE_FULL_RENDER_REQUIRED_CAPABLE = false;
  559.   const isContainSupport = CSS.supports('contain', 'layout paint style');
  560.   if (!isContainSupport) {
  561.     console.warn("Your browser does not support css property 'contain'.\nPlease upgrade to the latest version.".trim());
  562.   } else {
  563.     ENABLE_FULL_RENDER_REQUIRED_CAPABLE = true;
  564.   }
  565.  
  566.   let ENABLE_OVERFLOW_ANCHOR_CAPABLE = false;
  567.   const isOverflowAnchorSupport = CSS.supports('overflow-anchor', 'auto');
  568.   if (!isOverflowAnchorSupport) {
  569.     console.warn("Your browser does not support css property 'overflow-anchor'.\nPlease upgrade to the latest version.".trim());
  570.   } else {
  571.     ENABLE_OVERFLOW_ANCHOR_CAPABLE = true;
  572.   }
  573.  
  574.   const NOT_FIREFOX = !CSS.supports('-moz-appearance', 'none'); // 1. Firefox does not have the flicking issue; 2. Firefox's OVERFLOW_ANCHOR is less effective than Chromium's.
  575.  
  576.   const ENABLE_OVERFLOW_ANCHOR = ENABLE_OVERFLOW_ANCHOR_PREFERRED && ENABLE_OVERFLOW_ANCHOR_CAPABLE && ENABLE_NO_SMOOTH_TRANSFORM;
  577.   const ENABLE_FULL_RENDER_REQUIRED = ENABLE_FULL_RENDER_REQUIRED_PREFERRED && ENABLE_FULL_RENDER_REQUIRED_CAPABLE && ENABLE_OVERFLOW_ANCHOR && ENABLE_NO_SMOOTH_TRANSFORM && NOT_FIREFOX;
  578.  
  579.  
  580.   const fxOperator = (proto, propertyName) => {
  581.     let propertyDescriptorGetter = null;
  582.     try {
  583.       propertyDescriptorGetter = Object.getOwnPropertyDescriptor(proto, propertyName).get;
  584.     } catch (e) { }
  585.     return typeof propertyDescriptorGetter === 'function' ? (e) => {
  586.       try {
  587.  
  588.         return propertyDescriptorGetter.call(dr(e));
  589.       } catch (e) { }
  590.       return e[propertyName];
  591.     } : (e) => e[propertyName];
  592.   };
  593.  
  594.   const nodeParent = fxOperator(Node.prototype, 'parentNode');
  595.   // const nFirstElem = fxOperator(HTMLElement.prototype, 'firstElementChild');
  596.   const nPrevElem = fxOperator(HTMLElement.prototype, 'previousElementSibling');
  597.   const nNextElem = fxOperator(HTMLElement.prototype, 'nextElementSibling');
  598.   const nLastElem = fxOperator(HTMLElement.prototype, 'lastElementChild');
  599.  
  600.  
  601.   const groupCollapsed = (text1, text2) => {
  602.  
  603.     console.groupCollapsed(`%c${text1}%c${text2}`,
  604.       "background-color: #010502; color: #6acafe; font-weight: 700; padding: 2px;",
  605.       "background-color: #010502; color: #6ad9fe; font-weight: 300; padding: 2px;"
  606.     );
  607.   }
  608.  
  609.  
  610.   const EVENT_KEY_ON_REGISTRY_READY = "ytI-ce-registry-created";
  611.   const onRegistryReady = (callback) => {
  612.     if (typeof customElements === 'undefined') {
  613.       if (!('__CE_registry' in document)) {
  614.         // https://github.com/webcomponents/polyfills/
  615.         Object.defineProperty(document, '__CE_registry', {
  616.           get() {
  617.             // return undefined
  618.           },
  619.           set(nv) {
  620.             if (typeof nv == 'object') {
  621.               delete this.__CE_registry;
  622.               this.__CE_registry = nv;
  623.               this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
  624.             }
  625.             return true;
  626.           },
  627.           enumerable: false,
  628.           configurable: true
  629.         })
  630.       }
  631.       let eventHandler = (evt) => {
  632.         document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  633.         const f = callback;
  634.         callback = null;
  635.         eventHandler = null;
  636.         f();
  637.       };
  638.       document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  639.     } else {
  640.       callback();
  641.     }
  642.   };
  643.  
  644.   const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  645.  
  646.   /* globals WeakRef:false */
  647.  
  648.   /** @type {(o: Object | null) => WeakRef | null} */
  649.   const mWeakRef = typeof WeakRef === 'function' ? (o => o ? new WeakRef(o) : null) : (o => o || null);
  650.  
  651.   /** @type {(wr: Object | null) => Object | null} */
  652.   const kRef = (wr => (wr && wr.deref) ? wr.deref() : wr);
  653.  
  654.   const { addCssManaged } = (() => {
  655.  
  656.     const addFontPreRendering = () => {
  657.  
  658.       groupCollapsed("YouTube Super Fast Chat", " | Fonts Pre-Rendering");
  659.  
  660.       let efsContainer = document.createElement('elzm-fonts');
  661.       efsContainer.id = 'elzm-fonts-yk75g'
  662.  
  663.       const arr = [];
  664.       let p = document.createElement('elzm-font');
  665.       arr.push(p);
  666.  
  667.       if (ENABLE_FONT_PRE_RENDERING & 1) {
  668.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  669.  
  670.           p = document.createElement('elzm-font');
  671.           p.style.fontWeight = size;
  672.           arr.push(p);
  673.         }
  674.       }
  675.  
  676.       if (ENABLE_FONT_PRE_RENDERING & 2) {
  677.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  678.  
  679.           p = document.createElement('elzm-font');
  680.           p.style.fontFamily = 'Roboto';
  681.           p.style.fontWeight = size;
  682.           arr.push(p);
  683.         }
  684.       }
  685.  
  686.       if (ENABLE_FONT_PRE_RENDERING & 4) {
  687.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  688.  
  689.           p = document.createElement('elzm-font');
  690.           p.style.fontFamily = '"YouTube Noto",Roboto,Arial,Helvetica,sans-serif';
  691.           p.style.fontWeight = size;
  692.           arr.push(p);
  693.         }
  694.       }
  695.  
  696.  
  697.       if (ENABLE_FONT_PRE_RENDERING & 8) {
  698.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  699.  
  700.           p = document.createElement('elzm-font');
  701.           p.style.fontFamily = '"Noto",Roboto,Arial,Helvetica,sans-serif';
  702.           p.style.fontWeight = size;
  703.           arr.push(p);
  704.         }
  705.       }
  706.  
  707.  
  708.       if (ENABLE_FONT_PRE_RENDERING & 16) {
  709.         for (const size of [100, 200, 300, 400, 500, 600, 700, 800, 900]) {
  710.  
  711.           p = document.createElement('elzm-font');
  712.           p.style.fontFamily = 'sans-serif';
  713.           p.style.fontWeight = size;
  714.           arr.push(p);
  715.         }
  716.       }
  717.  
  718.       console.log('number of elzm-font elements', arr.length);
  719.  
  720.       HTMLElement.prototype.append.apply(efsContainer, arr);
  721.  
  722.       (document.body || document.documentElement).appendChild(efsContainer);
  723.  
  724.  
  725.       console.log('elzm-font elements have been added to the page for rendering.');
  726.  
  727.       console.groupEnd();
  728.  
  729.     }
  730.  
  731.     let isCssAdded = false;
  732.  
  733.     function addCssElement() {
  734.       let s = document.createElement('style');
  735.       s.id = 'ewRvC';
  736.       return s;
  737.     }
  738.  
  739.     const addCssManaged = () => {
  740.       if (!isCssAdded && document.documentElement && document.head) {
  741.         isCssAdded = true;
  742.         document.head.appendChild(dr(addCssElement())).textContent = addCss();
  743.         if (ENABLE_FONT_PRE_RENDERING) {
  744.           Promise.resolve().then(addFontPreRendering)
  745.         }
  746.       }
  747.     }
  748.  
  749.     return { addCssManaged };
  750.   })();
  751.  
  752.  
  753.   const { setupStyle } = (() => {
  754.  
  755.     const sp7 = Symbol();
  756.  
  757.     const proxyHelperFn = (dummy) => ({
  758.  
  759.       get(target, prop) {
  760.         return (prop in dummy) ? dummy[prop] : prop === sp7 ? target : target[prop];
  761.       },
  762.       set(target, prop, value) {
  763.         if (!(prop in dummy)) {
  764.           target[prop] = value;
  765.         }
  766.         return true;
  767.       },
  768.       has(target, prop) {
  769.         return (prop in target);
  770.       },
  771.       deleteProperty(target, prop) {
  772.         return true;
  773.       },
  774.       ownKeys(target) {
  775.         return Object.keys(target);
  776.       },
  777.       defineProperty(target, key, descriptor) {
  778.         return Object.defineProperty(target, key, descriptor);
  779.       },
  780.       getOwnPropertyDescriptor(target, key) {
  781.         return Object.getOwnPropertyDescriptor(target, key);
  782.       },
  783.  
  784.     });
  785.  
  786.     const setupStyle = (m1, m2) => {
  787.       if (!ENABLE_NO_SMOOTH_TRANSFORM) return;
  788.  
  789.       const dummy1v = {
  790.         transform: '',
  791.         height: '',
  792.         minHeight: '',
  793.         paddingBottom: '',
  794.         paddingTop: ''
  795.       };
  796.  
  797.       const dummyStyleFn = (k) => (function () { const style = this[sp7]; return style[k](...arguments); });
  798.       for (const k of ['toString', 'getPropertyPriority', 'getPropertyValue', 'item', 'removeProperty', 'setProperty']) {
  799.         dummy1v[k] = dummyStyleFn(k);
  800.       }
  801.  
  802.       const dummy1p = proxyHelperFn(dummy1v);
  803.       const sp1v = new Proxy(m1.style, dummy1p);
  804.       const sp2v = new Proxy(m2.style, dummy1p);
  805.       Object.defineProperty(m1, 'style', { get() { return sp1v }, set() { }, enumerable: true, configurable: true });
  806.       Object.defineProperty(m2, 'style', { get() { return sp2v }, set() { }, enumerable: true, configurable: true });
  807.       m1.removeAttribute("style");
  808.       m2.removeAttribute("style");
  809.  
  810.     }
  811.  
  812.     return { setupStyle };
  813.  
  814.   })();
  815.  
  816.  
  817.   const cleanContext = async (win) => {
  818.     const waitFn = requestAnimationFrame; // shall have been binded to window
  819.     try {
  820.       let mx = 16; // MAX TRIAL
  821.       const frameId = 'vanillajs-iframe-v1';
  822.       /** @type {HTMLIFrameElement | null} */
  823.       let frame = document.getElementById(frameId);
  824.       let removeIframeFn = null;
  825.       if (!frame) {
  826.         frame = document.createElement('iframe');
  827.         frame.id = 'vanillajs-iframe-v1';
  828.         frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
  829.         let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
  830.         n.appendChild(frame);
  831.         while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
  832.         const root = document.documentElement;
  833.         root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
  834.         removeIframeFn = (setTimeout) => {
  835.           const removeIframeOnDocumentReady = (e) => {
  836.             e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  837.             win = null;
  838.             setTimeout(() => {
  839.               n.remove();
  840.               n = null;
  841.             }, 200);
  842.           }
  843.           if (document.readyState !== 'loading') {
  844.             removeIframeOnDocumentReady();
  845.           } else {
  846.             win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  847.           }
  848.         }
  849.       }
  850.       while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
  851.       const fc = frame.contentWindow;
  852.       if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
  853.       const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval } = fc;
  854.       const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval };
  855.       for (let k in res) res[k] = res[k].bind(win); // necessary
  856.       if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
  857.       return res;
  858.     } catch (e) {
  859.       console.warn(e);
  860.       return null;
  861.     }
  862.   };
  863.  
  864.   const flagsFnOnInterval = (ENABLE_FLAGS_MAINTAIN_STABLE_LIST || ENABLE_FLAGS_REUSE_COMPONENTS) ? (() => {
  865.  
  866.     const flags = () => {
  867.       try {
  868.         return ytcfg.data_.EXPERIMENT_FLAGS;
  869.       } catch (e) { }
  870.       return null;
  871.     };
  872.  
  873.     const flagsForced = () => {
  874.       try {
  875.         return ytcfg.data_.EXPERIMENTS_FORCED_FLAGS;
  876.       } catch (e) { }
  877.       return null;
  878.     };
  879.  
  880.     const flagsFn = (EXPERIMENT_FLAGS) => {
  881.  
  882.       if (!EXPERIMENT_FLAGS) return;
  883.  
  884.       if (ENABLE_FLAGS_MAINTAIN_STABLE_LIST) {
  885.         EXPERIMENT_FLAGS.kevlar_tuner_should_test_maintain_stable_list = true;
  886.         EXPERIMENT_FLAGS.kevlar_should_maintain_stable_list = true;
  887.       }
  888.  
  889.       if (ENABLE_FLAGS_REUSE_COMPONENTS) {
  890.         EXPERIMENT_FLAGS.kevlar_tuner_should_test_reuse_components = true;
  891.         EXPERIMENT_FLAGS.kevlar_tuner_should_reuse_components = true;
  892.       }
  893.  
  894.     };
  895.  
  896.     const uf = (EXPERIMENT_FLAGS) => {
  897.       if (EXPERIMENT_FLAGS === undefined) EXPERIMENT_FLAGS = flags();
  898.       if (EXPERIMENT_FLAGS) {
  899.         flagsFn(EXPERIMENT_FLAGS);
  900.         flagsFn(flagsForced());
  901.       }
  902.     }
  903.  
  904.     uf();
  905.  
  906.     const flagsFnOnInterval = (setInterval, clearInterval) => {
  907.  
  908.       uf();
  909.       let cidFlags = 0;
  910.       let kd = 0;
  911.       new Promise(flagResolve => {
  912.  
  913.         const flagTimer = () => {
  914.           const EXPERIMENT_FLAGS = flags();
  915.           if (!EXPERIMENT_FLAGS) return;
  916.           uf(EXPERIMENT_FLAGS);
  917.           if (kd > 0) return;
  918.           kd = 1;
  919.           const delay1000 = new Promise(resolve => setTimeout(resolve, 1000));
  920.           const moDeferred = new Promise(resolve => {
  921.             let mo = new MutationObserver(() => {
  922.               if (mo) {
  923.                 mo.disconnect();
  924.                 mo.takeRecords();
  925.                 mo = null;
  926.                 resolve();
  927.               }
  928.             });
  929.             mo.observe(document, { subtree: true, childList: true });
  930.           });
  931.           Promise.race([delay1000, moDeferred]).then(flagResolve);
  932.         };
  933.  
  934.         uf();
  935.         cidFlags = setInterval(flagTimer, 1);
  936.       }).then(() => {
  937.         if (cidFlags > 0) clearInterval(cidFlags);
  938.         cidFlags = 0;
  939.         uf();
  940.       });
  941.  
  942.     }
  943.  
  944.     return flagsFnOnInterval;
  945.  
  946.   })() : null;
  947.  
  948.   cleanContext(win).then(__CONTEXT__ => {
  949.     if (!__CONTEXT__) return null;
  950.  
  951.     const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval } = __CONTEXT__;
  952.  
  953.     flagsFnOnInterval(setInterval, clearInterval);
  954.  
  955.     (() => {
  956.       // data manipulation
  957.  
  958.       if (!DO_PARTICIPANT_LIST_HACKS) return;
  959.  
  960.       class Mutex {
  961.  
  962.         constructor() {
  963.           this.p = Promise.resolve()
  964.         }
  965.  
  966.         /**
  967.          *  @param {(lockResolve: () => void)} f
  968.          */
  969.         lockWith(f) {
  970.           this.p = this.p.then(() => new Promise(f).catch(console.warn))
  971.         }
  972.  
  973.       }
  974.  
  975.  
  976.       /**
  977.  
  978.        h.onParticipantsChanged = function() {
  979.           this.notifyPath("participantsManager.participants")
  980.       }
  981.  
  982.  
  983.       at h.onParticipantsChanged (live_chat_polymer.js:8334:41)
  984.       at e.<anonymous> (live_chat_polymer.js:1637:69)
  985.       at e.Bb [as __shady_dispatchEvent] (webcomponents-sd.js:46:110)
  986.       at k.dispatchEvent (webcomponents-sd.js:122:237)
  987.       at mu (live_chat_polymer.js:1677:71)
  988.       at Object.wga [as fn] (live_chat_polymer.js:1678:99)
  989.       at a._propertiesChanged (live_chat_polymer.js:1726:426)
  990.       at b._flushProperties (live_chat_polymer.js:1597:200)
  991.       at a._invalidateProperties (live_chat_polymer.js:1718:69)
  992.       at a.notifyPath (live_chat_polymer.js:1741:182)
  993.  
  994.       */
  995.  
  996.  
  997.       const beforeParticipantsMap = new WeakMap();
  998.  
  999.       const { notifyPath7081 } = (() => {
  1000.  
  1001.         const mutexParticipants = new Mutex();
  1002.  
  1003.         let uvid = 0;
  1004.         let r95dm = 0;
  1005.         let c95dm = -1;
  1006.  
  1007.         const foundMap = (base, content) => {
  1008.           /*
  1009.             let lastSearch = 0;
  1010.             let founds = base.map(baseEntry => {
  1011.               let search = content.indexOf(baseEntry, lastSearch);
  1012.               if (search < 0) return false;
  1013.               lastSearch = search + 1;
  1014.               return true;
  1015.             });
  1016.             return founds;
  1017.           */
  1018.           const contentSet = new Set(content);
  1019.           return base.map(baseEntry => contentSet.has(baseEntry));
  1020.  
  1021.         }
  1022.  
  1023.  
  1024.  
  1025.         const spliceIndicesFunc = (beforeParticipants, participants, idsBefore, idsAfter) => {
  1026.  
  1027.           const handler1 = {
  1028.             get(target, prop, receiver) {
  1029.               if (prop === 'object') {
  1030.                 return participants; // avoid memory leakage
  1031.               }
  1032.               if (prop === 'type') {
  1033.                 return 'splice';
  1034.               }
  1035.               return target[prop];
  1036.             }
  1037.           };
  1038.           const releaser = () => {
  1039.             participants = null;
  1040.           }
  1041.  
  1042.           let foundsForAfter = foundMap(idsAfter, idsBefore);
  1043.           let foundsForBefore = foundMap(idsBefore, idsAfter);
  1044.  
  1045.           let indexSplices = [];
  1046.           let contentUpdates = [];
  1047.           for (let i = 0, j = 0; i < foundsForBefore.length || j < foundsForAfter.length;) {
  1048.             if (beforeParticipants[i] === participants[j]) {
  1049.               i++; j++;
  1050.             } else if (idsBefore[i] === idsAfter[j]) {
  1051.               // content changed
  1052.               contentUpdates.push({ indexI: i, indexJ: j })
  1053.               i++; j++;
  1054.             } else {
  1055.               let addedCount = 0;
  1056.               for (let q = j; q < foundsForAfter.length; q++) {
  1057.                 if (foundsForAfter[q] === false) addedCount++;
  1058.                 else break;
  1059.               }
  1060.               let removedCount = 0;
  1061.               for (let q = i; q < foundsForBefore.length; q++) {
  1062.                 if (foundsForBefore[q] === false) removedCount++;
  1063.                 else break;
  1064.               }
  1065.               if (!addedCount && !removedCount) {
  1066.                 throw 'ERROR(0xFF32): spliceIndicesFunc';
  1067.               }
  1068.               indexSplices.push(new Proxy({
  1069.                 index: j,
  1070.                 addedCount: addedCount,
  1071.                 removed: removedCount >= 1 ? beforeParticipants.slice(i, i + removedCount) : []
  1072.               }, handler1));
  1073.               i += removedCount;
  1074.               j += addedCount;
  1075.             }
  1076.           }
  1077.           foundsForBefore = null;
  1078.           foundsForAfter = null;
  1079.           idsBefore = null;
  1080.           idsAfter = null;
  1081.           beforeParticipants = null;
  1082.           return { indexSplices, contentUpdates, releaser };
  1083.  
  1084.         }
  1085.  
  1086.         /*
  1087.  
  1088.         customElements.get("yt-live-chat-participant-renderer").prototype.notifyPath=function(){  console.log(123);  console.log(new Error().stack)}
  1089.  
  1090.         VM63631:1 Error
  1091.         at customElements.get.notifyPath (<anonymous>:1:122)
  1092.         at e.forwardRendererStamperChanges_ (live_chat_polymer.js:4453:35)
  1093.         at e.rendererStamperApplyChangeRecord_ (live_chat_polymer.js:4451:12)
  1094.         at e.rendererStamperObserver_ (live_chat_polymer.js:4448:149)
  1095.         at Object.pu [as fn] (live_chat_polymer.js:1692:118)
  1096.         at ju (live_chat_polymer.js:1674:217)
  1097.         at a._propertiesChanged (live_chat_polymer.js:1726:122)
  1098.         at b._flushProperties (live_chat_polymer.js:1597:200)
  1099.         at a._invalidateProperties (live_chat_polymer.js:1718:69)
  1100.         at a.notifyPath (live_chat_polymer.js:1741:182)
  1101.  
  1102.         */
  1103.  
  1104.         function convertToIds(participants) {
  1105.           return participants.map(participant => {
  1106.             if (!participant || typeof participant !== 'object') {
  1107.               console.warn('Error(0xFA41): convertToIds', participant);
  1108.               return participant; // just in case
  1109.             }
  1110.             let keys = Object.keys(participant);
  1111.             // liveChatTextMessageRenderer
  1112.             // liveChatParticipantRenderer - livestream channel owner [no authorExternalChannelId]
  1113.             // liveChatPaidMessageRenderer
  1114.             /*
  1115.  
  1116.               'yt-live-chat-participant-renderer' utilizes the following:
  1117.               authorName.simpleText: string
  1118.               authorPhoto.thumbnails: Object{url:string, width:int, height:int} []
  1119.               authorBadges[].liveChatAuthorBadgeRenderer.icon.iconType: string
  1120.               authorBadges[].liveChatAuthorBadgeRenderer.tooltip: string
  1121.               authorBadges[].liveChatAuthorBadgeRenderer.accessibility.accessibilityData: Object{label:string}
  1122.  
  1123.             */
  1124.             if (keys.length !== 1) {
  1125.               console.warn('Error(0xFA42): convertToIds', participant);
  1126.               return participant; // just in case
  1127.             }
  1128.             let key = keys[0];
  1129.             let renderer = (participant[key] || 0);
  1130.             let authorName = (renderer.authorName || 0);
  1131.             let text = `${authorName.simpleText || authorName.text}`
  1132.             let res = participant; // fallback if it is not a vaild entry
  1133.             if (typeof text !== 'string') {
  1134.               console.warn('Error(0xFA53): convertToIds', participant);
  1135.             } else {
  1136.               text = `${renderer.authorExternalChannelId || 'null'}|${text || ''}`;
  1137.               if (text.length > 1) res = text;
  1138.             }
  1139.             return res;
  1140.             // return renderer?`${renderer.id}|${renderer.authorExternalChannelId}`: '';
  1141.             // note: renderer.id will be changed if the user typed something to trigger the update of the participants' record.
  1142.           });
  1143.         }
  1144.  
  1145.         const checkChangeToParticipantRendererContent = CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT ? (p1, p2) => {
  1146.           // just update when content is changed.
  1147.           if (p1.authorName !== p2.authorName) return true;
  1148.           if (p1.authorPhoto !== p2.authorPhoto) return true;
  1149.           if (p1.authorBadges !== p2.authorBadges) return true;
  1150.           return false;
  1151.         } : (p1, p2) => {
  1152.           // keep integrity all the time.
  1153.           return p1 !== p2; // always true
  1154.         }
  1155.  
  1156.         function notifyPath7081(path) { // cnt "yt-live-chat-participant-list-renderer"
  1157.  
  1158.           if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
  1159.             if (path !== "participantsManager.participants") {
  1160.               return this.__notifyPath5036__.apply(this, arguments);
  1161.             }
  1162.             if (c95dm === r95dm) return;
  1163.           } else {
  1164.             const stack = new Error().stack;
  1165.             if (path !== "participantsManager.participants" || stack.indexOf('.onParticipantsChanged') < 0) {
  1166.               return this.__notifyPath5036__.apply(this, arguments);
  1167.             }
  1168.           }
  1169.  
  1170.           if (uvid > 1e8) uvid = uvid % 100;
  1171.           let tid = ++uvid;
  1172.  
  1173.           const cnt = this; // "yt-live-chat-participant-list-renderer"
  1174.           mutexParticipants.lockWith(lockResolve => {
  1175.  
  1176.             const participants00 = cnt.participantsManager.participants;
  1177.  
  1178.             if (tid !== uvid || typeof (participants00 || 0).splice !== 'function') {
  1179.               lockResolve();
  1180.               return;
  1181.             }
  1182.  
  1183.             let doUpdate = false;
  1184.  
  1185.             if (PARTICIPANT_UPDATE_ONLY_ONLY_IF_MODIFICATION_DETECTED) {
  1186.  
  1187.               if (!participants00.r94dm) {
  1188.                 participants00.r94dm = 1;
  1189.                 if (++r95dm > 1e9) r95dm = 9;
  1190.                 participants00.push = function () {
  1191.                   if (++r95dm > 1e9) r95dm = 9;
  1192.                   return Array.prototype.push.apply(this, arguments);
  1193.                 }
  1194.                 participants00.pop = function () {
  1195.                   if (++r95dm > 1e9) r95dm = 9;
  1196.                   return Array.prototype.pop.apply(this, arguments);
  1197.                 }
  1198.                 participants00.shift = function () {
  1199.                   if (++r95dm > 1e9) r95dm = 9;
  1200.                   return Array.prototype.shift.apply(this, arguments);
  1201.                 }
  1202.                 participants00.unshift = function () {
  1203.                   if (++r95dm > 1e9) r95dm = 9;
  1204.                   return Array.prototype.unshift.apply(this, arguments);
  1205.                 }
  1206.                 participants00.splice = function () {
  1207.                   if (++r95dm > 1e9) r95dm = 9;
  1208.                   return Array.prototype.splice.apply(this, arguments);
  1209.                 }
  1210.                 participants00.sort = function () {
  1211.                   if (++r95dm > 1e9) r95dm = 9;
  1212.                   return Array.prototype.sort.apply(this, arguments);
  1213.                 }
  1214.                 participants00.reverse = function () {
  1215.                   if (++r95dm > 1e9) r95dm = 9;
  1216.                   return Array.prototype.reverse.apply(this, arguments);
  1217.                 }
  1218.               }
  1219.  
  1220.               if (c95dm !== r95dm) {
  1221.                 c95dm = r95dm;
  1222.                 doUpdate = true;
  1223.               }
  1224.  
  1225.             } else {
  1226.               doUpdate = true;
  1227.             }
  1228.  
  1229.             if (!doUpdate) {
  1230.               lockResolve();
  1231.               return;
  1232.             }
  1233.  
  1234.             const participants = participants00.slice(0);
  1235.             const beforeParticipants = beforeParticipantsMap.get(cnt) || [];
  1236.             beforeParticipantsMap.set(cnt, participants);
  1237.  
  1238.             const resPromise = (async () => {
  1239.  
  1240.               if (beforeParticipants.length === 0) {
  1241.                 // not error
  1242.                 return 0;
  1243.               }
  1244.  
  1245.               let countOfElements = cnt.__getAllParticipantsDOMRenderedLength__()
  1246.  
  1247.               // console.log(participants.length, doms.length) // different if no requestAnimationFrame
  1248.               if (beforeParticipants.length !== countOfElements) {
  1249.                 // there is somewrong for the cache. - sometimes happen
  1250.                 return 0;
  1251.               }
  1252.  
  1253.               const idsBefore = convertToIds(beforeParticipants);
  1254.               const idsAfter = convertToIds(participants);
  1255.  
  1256.               let { indexSplices, contentUpdates, releaser } = spliceIndicesFunc(beforeParticipants, participants, idsBefore, idsAfter);
  1257.  
  1258.               let res = 1; // default 1 for no update
  1259.  
  1260.               if (indexSplices.length >= 1) {
  1261.  
  1262.  
  1263.                 // let p2 =  participants.slice(indexSplices[0].index, indexSplices[0].index+indexSplices[0].addedCount);
  1264.                 // let p1 = indexSplices[0].removed;
  1265.                 // console.log(indexSplices.length, indexSplices ,p1,p2,  convertToIds(p1),convertToIds(p2))
  1266.  
  1267.                 /* folllow
  1268.                     a.notifyPath(c + ".splices", d);
  1269.                     a.notifyPath(c + ".length", b.length);
  1270.                 */
  1271.                 // stampDomArraySplices_
  1272.  
  1273.  
  1274.                 await new Promise(resolve => {
  1275.                   cnt.resolveForDOMRendering781 = resolve;
  1276.  
  1277.                   cnt.__notifyPath5036__("participantsManager.participants.splices", {
  1278.                     indexSplices
  1279.                   });
  1280.                   indexSplices = null;
  1281.                   releaser();
  1282.                   releaser = null;
  1283.                   cnt.__notifyPath5036__("participantsManager.participants.length",
  1284.                     participants.length
  1285.                   );
  1286.  
  1287.                 });
  1288.  
  1289.                 await Promise.resolve(0); // play safe for the change of 'length'
  1290.                 countOfElements = cnt.__getAllParticipantsDOMRenderedLength__();
  1291.  
  1292.                 let wrongSize = participants.length !== countOfElements
  1293.                 if (wrongSize) {
  1294.                   console.warn("ERROR(0xE2C3): notifyPath7081", beforeParticipants.length, participants.length, doms.length)
  1295.                   return 0;
  1296.                 }
  1297.  
  1298.                 res = 2 | 4;
  1299.  
  1300.               } else {
  1301.  
  1302.                 indexSplices = null;
  1303.                 releaser();
  1304.                 releaser = null;
  1305.  
  1306.                 if (participants.length !== countOfElements) {
  1307.                   // other unhandled cases
  1308.                   return 0;
  1309.                 }
  1310.  
  1311.               }
  1312.  
  1313.               // participants.length === countOfElements before contentUpdates
  1314.               if (contentUpdates.length >= 1) {
  1315.                 for (const contentUpdate of contentUpdates) {
  1316.                   let isChanged = checkChangeToParticipantRendererContent(beforeParticipants[contentUpdate.indexI], participants[contentUpdate.indexJ]);
  1317.                   if (isChanged) {
  1318.                     cnt.__notifyPath5036__(`participantsManager.participants[${contentUpdate.indexJ}]`);
  1319.                     res |= 4 | 8;
  1320.                   }
  1321.                 }
  1322.               }
  1323.               contentUpdates = null;
  1324.  
  1325.               return res;
  1326.  
  1327.  
  1328.             })();
  1329.  
  1330.  
  1331.             resPromise.then(resValue => {
  1332.  
  1333.               const isLogRequired = SHOW_PARTICIPANT_CHANGES_IN_CONSOLE && ((resValue === 0) || ((resValue & 4) === 4));
  1334.               isLogRequired && groupCollapsed("Participant List Change", `tid = ${tid}; res = ${resValue}`);
  1335.               if (resValue === 0) {
  1336.                 new Promise(resolve => {
  1337.                   cnt.resolveForDOMRendering781 = resolve;
  1338.                   isLogRequired && console.log("Full Refresh begins");
  1339.                   cnt.__notifyPath5036__("participantsManager.participants"); // full refresh
  1340.                 }).then(() => {
  1341.                   isLogRequired && console.log("Full Refresh ends");
  1342.                   console.groupEnd();
  1343.                 }).then(lockResolve);
  1344.                 return;
  1345.               }
  1346.  
  1347.               const delayLockResolve = (resValue & 4) === 4;
  1348.  
  1349.               if (delayLockResolve) {
  1350.                 isLogRequired && console.log(`Number of participants (before): ${beforeParticipants.length}`);
  1351.                 isLogRequired && console.log(`Number of participants (after): ${participants.length}`);
  1352.                 isLogRequired && console.log(`Total number of rendered participants: ${cnt.__getAllParticipantsDOMRenderedLength__()}`);
  1353.                 isLogRequired && console.log(`Participant Renderer Content Updated: ${(resValue & 8) === 8}`);
  1354.                 isLogRequired && console.groupEnd();
  1355.                 // requestAnimationFrame is required to avoid particiant update during DOM changing (stampDomArraySplices_)
  1356.                 // mutex lock with requestAnimationFrame can also disable participants update in background
  1357.                 requestAnimationFrame(lockResolve);
  1358.               } else {
  1359.                 lockResolve();
  1360.               }
  1361.  
  1362.             });
  1363.  
  1364.           });
  1365.  
  1366.         }
  1367.  
  1368.         return { notifyPath7081 };
  1369.  
  1370.       })();
  1371.  
  1372.  
  1373.       const onRegistryReadyForDataManipulation = () => {
  1374.  
  1375.         function dummy5035(a, b, c) { }
  1376.         function dummy411(a, b, c) { }
  1377.  
  1378.         customElements.whenDefined("yt-live-chat-participant-list-renderer").then(() => {
  1379.  
  1380.           if (!DO_PARTICIPANT_LIST_HACKS) return;
  1381.  
  1382.           const tag = "yt-live-chat-participant-list-renderer"
  1383.           const cProto = getProto(document.createElement(tag));
  1384.           if (!cProto || typeof cProto.attached !== 'function') {
  1385.             // for _registered, proto.attached shall exist when the element is defined.
  1386.             // for controller extraction, attached shall exist when instance creates.
  1387.             console.warn(`proto.attached for ${tag} is unavailable.`);
  1388.             return;
  1389.           }
  1390.  
  1391.  
  1392.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-participant-list-renderer hacks");
  1393.  
  1394.           const canDoReplacement = (() => {
  1395.             if (typeof cProto.__notifyPath5035__ === 'function' && cProto.__notifyPath5035__.name !== 'dummy5035') {
  1396.               console.warn('YouTube Live Chat Tamer is running.');
  1397.               return;
  1398.             }
  1399.  
  1400.             if (typeof cProto.__attached411__ === 'function' && cProto.__attached411__.name !== 'dummy411') {
  1401.               console.warn('YouTube Live Chat Tamer is running.');
  1402.               return;
  1403.             }
  1404.  
  1405.             cProto.__notifyPath5035__ = dummy5035 // just to against Live Chat Tamer
  1406.             cProto.__attached411__ = dummy411 // just to against Live Chat Tamer
  1407.  
  1408.             if (typeof cProto.flushRenderStamperComponentBindings_ !== 'function' || cProto.flushRenderStamperComponentBindings_.length !== 0) {
  1409.               console.warn("ERROR(0xE355): cProto.flushRenderStamperComponentBindings_ not found");
  1410.               return;
  1411.             }
  1412.  
  1413.             if (typeof cProto.flushRenderStamperComponentBindings66_ === 'function') {
  1414.               console.warn("ERROR(0xE356): cProto.flushRenderStamperComponentBindings66_");
  1415.               return;
  1416.             }
  1417.  
  1418.             if (typeof cProto.__getAllParticipantsDOMRenderedLength__ === 'function') {
  1419.               console.warn("ERROR(0xE357): cProto.__getAllParticipantsDOMRenderedLength__");
  1420.               return;
  1421.             }
  1422.             return true;
  1423.           })();
  1424.  
  1425.           console.log(`Data Manipulation Boost = ${canDoReplacement}`);
  1426.  
  1427.  
  1428.           assertor(() => fnIntegrity(cProto.attached, '0.32.22')) // just warning
  1429.           assertor(() => fnIntegrity(cProto.flushRenderStamperComponentBindings_, '0.386.233')) // just warning
  1430.  
  1431.  
  1432.           cProto.flushRenderStamperComponentBindings66_ = cProto.flushRenderStamperComponentBindings_;
  1433.  
  1434.           cProto.flushRenderStamperComponentBindings_ = function () {
  1435.             // console.log('flushRenderStamperComponentBindings_')
  1436.             this.flushRenderStamperComponentBindings66_();
  1437.             if (this.resolveForDOMRendering781) {
  1438.               this.resolveForDOMRendering781();
  1439.               this.resolveForDOMRendering781 = null;
  1440.             }
  1441.           }
  1442.  
  1443.           cProto.__getAllParticipantsDOMRenderedLength__ = function () {
  1444.             const container = this.$.participants;
  1445.             return HTMLElement.prototype.querySelectorAll.call(container, 'yt-live-chat-participant-renderer').length;
  1446.           }
  1447.  
  1448.           const onPageElements = [...document.querySelectorAll('yt-live-chat-participant-list-renderer:not(.n9fJ3)')];
  1449.  
  1450.           cProto.__attached412__ = cProto.attached;
  1451.           const fpPList = function (hostElement) {
  1452.             const cnt = hostElement.inst || hostElement;
  1453.             if (beforeParticipantsMap.has(cnt)) return;
  1454.             hostElement.classList.add('n9fJ3');
  1455.  
  1456.             assertor(() => (cnt.__dataEnabled === true && cnt.__dataReady === true));
  1457.             if (typeof cnt.notifyPath !== 'function' || typeof cnt.__notifyPath5036__ !== 'undefined') {
  1458.               console.warn("ERROR(0xE318): yt-live-chat-participant-list-renderer")
  1459.               return;
  1460.             }
  1461.  
  1462.             groupCollapsed("Participant List attached", "");
  1463.             // cnt.$.participants.appendChild = cnt.$.participants.__shady_native_appendChild =  function(){
  1464.             //   console.log(123, 'appendChild');
  1465.             //   return HTMLElement.prototype.appendChild.apply(this, arguments)
  1466.             // }
  1467.  
  1468.             // cnt.$.participants.insertBefore =cnt.$.participants.__shady_native_insertBefore =  function(){
  1469.             //   console.log(123, 'insertBefore');
  1470.             //   return HTMLElement.prototype.insertBefore.apply(this, arguments)
  1471.             // }
  1472.  
  1473.             cnt.__notifyPath5036__ = cnt.notifyPath
  1474.             const participants = ((cnt.participantsManager || 0).participants || 0);
  1475.             assertor(() => (participants.length > -1 && typeof participants.slice === 'function'));
  1476.             console.log(`initial number of participants: ${participants.length}`);
  1477.             const newParticipants = (participants.length >= 1 && typeof participants.slice === 'function') ? participants.slice(0) : [];
  1478.             beforeParticipantsMap.set(cnt, newParticipants);
  1479.             cnt.notifyPath = notifyPath7081;
  1480.             console.log(`CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT = ${CHECK_CHANGE_TO_PARTICIPANT_RENDERER_CONTENT}`);
  1481.             console.groupEnd();
  1482.           }
  1483.           cProto.attached = function () {
  1484.             fpPList(this.hostElement || this);
  1485.             this.__attached412__.apply(this, arguments);
  1486.           };
  1487.  
  1488.           console.groupEnd();
  1489.  
  1490.           if (onPageElements.length >= 1) {
  1491.             for (const s of onPageElements) {
  1492.               if ((s.inst || s).isAttached === true) {
  1493.                 fpPList(s);
  1494.               }
  1495.             }
  1496.           }
  1497.  
  1498.         });
  1499.  
  1500.       };
  1501.  
  1502.       promiseForCustomYtElementsReady.then(onRegistryReadyForDataManipulation);
  1503.  
  1504.  
  1505.     })();
  1506.  
  1507.     IntersectionObserver && (() => {
  1508.  
  1509.       // dom manipulation
  1510.  
  1511.       class RAFHub {
  1512.         constructor() {
  1513.           /** @type {number} */
  1514.           this.startAt = 8170;
  1515.           /** @type {number} */
  1516.           this.counter = 0;
  1517.           /** @type {number} */
  1518.           this.rid = 0;
  1519.           /** @type {Map<number, FrameRequestCallback>} */
  1520.           this.funcs = new Map();
  1521.           const funcs = this.funcs;
  1522.           /** @type {FrameRequestCallback} */
  1523.           this.bCallback = this.mCallback.bind(this);
  1524.           this.pClear = () => funcs.clear();
  1525.         }
  1526.         /** @param {DOMHighResTimeStamp} highResTime */
  1527.         mCallback(highResTime) {
  1528.           this.rid = 0;
  1529.           Promise.resolve().then(this.pClear);
  1530.           this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
  1531.         }
  1532.         /** @param {FrameRequestCallback} f */
  1533.         request(f) {
  1534.           if (this.counter > 1e9) this.counter = 9;
  1535.           let cid = this.startAt + (++this.counter);
  1536.           this.funcs.set(cid, f);
  1537.           if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
  1538.           return cid;
  1539.         }
  1540.         /** @param {number} cid */
  1541.         cancel(cid) {
  1542.           cid = +cid;
  1543.           if (cid > 0) {
  1544.             if (cid <= this.startAt) {
  1545.               return cancelAnimationFrame(cid);
  1546.             }
  1547.             if (this.rid > 0) {
  1548.               this.funcs.delete(cid);
  1549.               if (this.funcs.size === 0) {
  1550.                 cancelAnimationFrame(this.rid);
  1551.                 this.rid = 0;
  1552.               }
  1553.             }
  1554.           }
  1555.         }
  1556.       }
  1557.  
  1558.  
  1559.       const rafHub = (ENABLE_RAF_HACK_TICKERS || ENABLE_RAF_HACK_DOCKED_MESSAGE || ENABLE_RAF_HACK_INPUT_RENDERER || ENABLE_RAF_HACK_EMOJI_PICKER) ? new RAFHub() : null;
  1560.  
  1561.  
  1562.       let dt0 = Date.now() - 2000;
  1563.       const dateNow = () => Date.now() - dt0;
  1564.       // let lastScroll = 0;
  1565.       // let lastLShow = 0;
  1566.       let lastWheel = 0;
  1567.       let lastMouseDown = 0;
  1568.       let lastMouseUp = 0;
  1569.       let currentMouseDown = false;
  1570.       let lastTouchDown = 0;
  1571.       let lastTouchUp = 0;
  1572.       let currentTouchDown = false;
  1573.       let lastUserInteraction = 0;
  1574.  
  1575.       let scrollChatFn = null;
  1576.  
  1577.       ENABLE_FULL_RENDER_REQUIRED && (() => {
  1578.  
  1579.         document.addEventListener('animationstart', (evt) => {
  1580.  
  1581.           if (evt.animationName === 'dontRenderAnimation') {
  1582.             evt.target.classList.remove('dont-render');
  1583.             if (scrollChatFn) scrollChatFn();
  1584.           }
  1585.  
  1586.         }, true);
  1587.  
  1588.         const f = (elm) => {
  1589.           if (elm && elm.nodeType === 1) {
  1590.             elm.classList.add('dont-render');
  1591.           }
  1592.         }
  1593.  
  1594.         Node.prototype.__appendChild931__ = function (a) {
  1595.           a = dr(a);
  1596.           if (this.id === 'items' && this.classList.contains('yt-live-chat-item-list-renderer')) {
  1597.             if (a && a.nodeType === 1) f(a);
  1598.             else if (a instanceof DocumentFragment) {
  1599.               for (let n = a.firstChild; n; n = n.nextSibling) {
  1600.                 f(n);
  1601.               }
  1602.             }
  1603.           }
  1604.         }
  1605.  
  1606.         Node.prototype.__appendChild932__ = function () {
  1607.           this.__appendChild931__.apply(this, arguments);
  1608.           return Node.prototype.appendChild.apply(this, arguments);
  1609.         }
  1610.  
  1611.  
  1612.       })();
  1613.  
  1614.  
  1615.       const watchUserCSS = () => {
  1616.  
  1617.         // if (!CSS.supports('contain-intrinsic-size', 'auto var(--wsr94)')) return;
  1618.  
  1619.         const getElemFromWR = (nr) => {
  1620.           const n = kRef(nr);
  1621.           if (n && n.isConnected) return n;
  1622.           return null;
  1623.         }
  1624.  
  1625.         const clearContentVisibilitySizing = () => {
  1626.           Promise.resolve().then(() => {
  1627.  
  1628.             let btnShowMoreWR = mWeakRef(document.querySelector('#show-more[disabled]'));
  1629.  
  1630.             let lastVisibleItemWR = null;
  1631.             for (const elm of document.querySelectorAll('[wSr93]')) {
  1632.               if (elm.getAttribute('wSr93') === 'visible') lastVisibleItemWR = mWeakRef(elm);
  1633.               elm.setAttribute('wSr93', '');
  1634.               // custom CSS property --wsr94 not working when attribute wSr93 removed
  1635.             }
  1636.             requestAnimationFrame(() => {
  1637.               const btnShowMore = getElemFromWR(btnShowMoreWR); btnShowMoreWR = null;
  1638.               if (btnShowMore) btnShowMore.click();
  1639.               else {
  1640.                 // would not work if switch it frequently
  1641.                 const lastVisibleItem = getElemFromWR(lastVisibleItemWR); lastVisibleItemWR = null;
  1642.                 if (lastVisibleItem) {
  1643.  
  1644.                   Promise.resolve()
  1645.                     .then(() => lastVisibleItem.scrollIntoView())
  1646.                     .then(() => lastVisibleItem.scrollIntoView(false))
  1647.                     .then(() => lastVisibleItem.scrollIntoView({ behavior: "instant", block: "end", inline: "nearest" }))
  1648.                     .catch(e => { }) // break the chain when method not callable
  1649.  
  1650.                 }
  1651.               }
  1652.             });
  1653.  
  1654.           });
  1655.  
  1656.         }
  1657.  
  1658.         const mutObserver = new MutationObserver((mutations) => {
  1659.           for (const mutation of mutations) {
  1660.             if ((mutation.addedNodes || 0).length >= 1) {
  1661.               for (const addedNode of mutation.addedNodes) {
  1662.                 if (addedNode.nodeName === 'STYLE') {
  1663.                   clearContentVisibilitySizing();
  1664.                   return;
  1665.                 }
  1666.               }
  1667.             }
  1668.             if ((mutation.removedNodes || 0).length >= 1) {
  1669.               for (const removedNode of mutation.removedNodes) {
  1670.                 if (removedNode.nodeName === 'STYLE') {
  1671.                   clearContentVisibilitySizing();
  1672.                   return;
  1673.                 }
  1674.               }
  1675.             }
  1676.           }
  1677.         });
  1678.  
  1679.         mutObserver.observe(document.documentElement, {
  1680.           childList: true,
  1681.           subtree: false
  1682.         });
  1683.         mutObserver.observe(document.head, {
  1684.           childList: true,
  1685.           subtree: false
  1686.         });
  1687.         mutObserver.observe(document.body, {
  1688.           childList: true,
  1689.           subtree: false
  1690.         });
  1691.  
  1692.       }
  1693.  
  1694.  
  1695.       class WillChangeController {
  1696.         constructor(itemScroller, willChangeValue) {
  1697.           this.element = itemScroller;
  1698.           this.counter = 0;
  1699.           this.active = false;
  1700.           this.willChangeValue = willChangeValue;
  1701.         }
  1702.  
  1703.         beforeOper() {
  1704.           if (!this.active) {
  1705.             this.active = true;
  1706.             this.element.style.willChange = this.willChangeValue;
  1707.           }
  1708.           this.counter++;
  1709.         }
  1710.  
  1711.         afterOper() {
  1712.           const c = this.counter;
  1713.           requestAnimationFrame(() => {
  1714.             if (c === this.counter) {
  1715.               this.active = false;
  1716.               this.element.style.willChange = '';
  1717.             }
  1718.           });
  1719.         }
  1720.  
  1721.         release() {
  1722.           const element = this.element;
  1723.           this.element = null;
  1724.           this.counter = 1e16;
  1725.           this.active = false;
  1726.           try {
  1727.             element.style.willChange = '';
  1728.           } catch (e) { }
  1729.         }
  1730.  
  1731.       }
  1732.  
  1733.  
  1734.       const { lcRendererElm, visObserver } = (() => {
  1735.  
  1736.  
  1737.  
  1738.         let lcRendererWR = null;
  1739.  
  1740.         const lcRendererElm = () => {
  1741.           let lcRenderer = kRef(lcRendererWR);
  1742.           if (!lcRenderer || !lcRenderer.isConnected) {
  1743.             lcRenderer = document.querySelector('yt-live-chat-item-list-renderer.yt-live-chat-renderer');
  1744.             lcRendererWR = lcRenderer ? mWeakRef(lcRenderer) : null;
  1745.           }
  1746.           return lcRenderer;
  1747.         };
  1748.  
  1749.  
  1750.         let hasFirstShowMore = false;
  1751.  
  1752.         const visObserverFn = (entry) => {
  1753.  
  1754.           const target = entry.target;
  1755.           if (!target) return;
  1756.           // if(target.classList.contains('dont-render')) return;
  1757.           let isVisible = entry.isIntersecting === true && entry.intersectionRatio > 0.5;
  1758.           // const h = entry.boundingClientRect.height;
  1759.           /*
  1760.           if (h < 16) { // wrong: 8 (padding/margin); standard: 32; test: 16 or 20
  1761.               // e.g. under fullscreen. the element created but not rendered.
  1762.               target.setAttribute('wSr93', '');
  1763.               return;
  1764.           }
  1765.           */
  1766.           if (isVisible) {
  1767.             // target.style.setProperty('--wsr94', h + 'px');
  1768.             target.setAttribute('wSr93', 'visible');
  1769.             if (nNextElem(target) === null) {
  1770.  
  1771.               // firstVisibleItemDetected = true;
  1772.               /*
  1773.                 if (dateNow() - lastScroll < 80) {
  1774.                     lastLShow = 0;
  1775.                     lastScroll = 0;
  1776.                     Promise.resolve().then(clickShowMore);
  1777.                 } else {
  1778.                     lastLShow = dateNow();
  1779.                 }
  1780.                 */
  1781.               // lastLShow = dateNow();
  1782.             } else if (!hasFirstShowMore) { // should more than one item being visible
  1783.               // implement inside visObserver to ensure there is sufficient delay
  1784.               hasFirstShowMore = true;
  1785.               requestAnimationFrame(() => {
  1786.                 // foreground page
  1787.                 // page visibly ready -> load the latest comments at initial loading
  1788.                 const lcRenderer = lcRendererElm();
  1789.                 if (lcRenderer) {
  1790.                   (lcRenderer.inst || lcRenderer).scrollToBottom_();
  1791.                 }
  1792.               });
  1793.             }
  1794.           }
  1795.           else if (target.getAttribute('wSr93') === 'visible') { // ignore target.getAttribute('wSr93') === '' to avoid wrong sizing
  1796.  
  1797.             // target.style.setProperty('--wsr94', h + 'px');
  1798.             target.setAttribute('wSr93', 'hidden');
  1799.           } // note: might consider 0 < entry.intersectionRatio < 0.5 and target.getAttribute('wSr93') === '' <new last item>
  1800.  
  1801.         }
  1802.  
  1803.  
  1804.  
  1805.         const visObserver = new IntersectionObserver((entries) => {
  1806.  
  1807.           for (const entry of entries) {
  1808.  
  1809.             Promise.resolve(entry).then(visObserverFn);
  1810.  
  1811.           }
  1812.  
  1813.         }, {
  1814.           // root: HTMLElement.prototype.closest.call(m2, '#item-scroller.yt-live-chat-item-list-renderer'), // nullable
  1815.           rootMargin: "0px",
  1816.           threshold: [0.05, 0.95],
  1817.         });
  1818.  
  1819.  
  1820.         return { lcRendererElm, visObserver }
  1821.  
  1822.  
  1823.       })();
  1824.  
  1825.       const { setupMutObserver } = (() => {
  1826.  
  1827.         const mutFn = (items) => {
  1828.           for (let node = nLastElem(items); node !== null; node = nPrevElem(node)) {
  1829.             if (node.hasAttribute('wSr93')) break;
  1830.             node.setAttribute('wSr93', '');
  1831.             visObserver.observe(node);
  1832.           }
  1833.         }
  1834.  
  1835.         const mutObserver = new MutationObserver((mutations) => {
  1836.           const items = (mutations[0] || 0).target;
  1837.           if (!items) return;
  1838.           mutFn(items);
  1839.         });
  1840.  
  1841.         const setupMutObserver = (m2) => {
  1842.           scrollChatFn = null;
  1843.           mutObserver.disconnect();
  1844.           mutObserver.takeRecords();
  1845.           if (m2) {
  1846.             if (typeof m2.__appendChild932__ === 'function') {
  1847.               if (typeof m2.appendChild === 'function') m2.appendChild = m2.__appendChild932__;
  1848.               if (typeof m2.__shady_native_appendChild === 'function') m2.__shady_native_appendChild = m2.__appendChild932__;
  1849.             }
  1850.             mutObserver.observe(m2, {
  1851.               childList: true,
  1852.               subtree: false
  1853.             });
  1854.             mutFn(m2);
  1855.  
  1856.  
  1857.             if (ENABLE_OVERFLOW_ANCHOR) {
  1858.  
  1859.               let items = m2;
  1860.               let addedAnchor = false;
  1861.               if (items) {
  1862.                 if (items.nextElementSibling === null) {
  1863.                   items.classList.add('no-anchor');
  1864.                   addedAnchor = true;
  1865.                   items.parentNode.appendChild(dr(document.createElement('item-anchor')));
  1866.                 }
  1867.               }
  1868.  
  1869.  
  1870.  
  1871.               if (addedAnchor) {
  1872.                 nodeParent(m2).classList.add('no-anchor'); // required
  1873.               }
  1874.  
  1875.             }
  1876.  
  1877.             // let div = document.createElement('div');
  1878.             // div.id = 'qwcc';
  1879.             // HTMLElement.prototype.appendChild.call(document.querySelector('yt-live-chat-item-list-renderer'), div )
  1880.             // bufferRegion =div;
  1881.  
  1882.             // buffObserver.takeRecords();
  1883.             // buffObserver.disconnect();
  1884.             // buffObserver.observe(div,  {
  1885.             //     childList: true,
  1886.             //     subtree: false
  1887.             // })
  1888.  
  1889.  
  1890.  
  1891.           }
  1892.         }
  1893.  
  1894.         return { setupMutObserver };
  1895.  
  1896.  
  1897.  
  1898.       })();
  1899.  
  1900.       const setupEvents = () => {
  1901.  
  1902.  
  1903.         let scrollCount = 0;
  1904.  
  1905.         const passiveCapture = typeof IntersectionObserver === 'function' ? { capture: true, passive: true } : true;
  1906.  
  1907.  
  1908.         const delayFlushActiveItemsAfterUserActionK_ = () => {
  1909.  
  1910.           const lcRenderer = lcRendererElm();
  1911.           if (lcRenderer) {
  1912.             const cnt = (lcRenderer.inst || lcRenderer);
  1913.             if (!cnt.hasUserJustInteracted11_) return;
  1914.             if (cnt.atBottom && cnt.allowScroll && cnt.activeItems_.length >= 1 && cnt.hasUserJustInteracted11_()) {
  1915.               cnt.delayFlushActiveItemsAfterUserAction11_ && cnt.delayFlushActiveItemsAfterUserAction11_();
  1916.             }
  1917.           }
  1918.  
  1919.         }
  1920.  
  1921.         document.addEventListener('scroll', (evt) => {
  1922.           if (!evt || !evt.isTrusted) return;
  1923.           // lastScroll = dateNow();
  1924.           if (++scrollCount > 1e9) scrollCount = 9;
  1925.         }, passiveCapture); // support contain => support passive
  1926.  
  1927.         let lastScrollCount = -1;
  1928.         document.addEventListener('wheel', (evt) => {
  1929.           if (!evt || !evt.isTrusted) return;
  1930.           if (lastScrollCount === scrollCount) return;
  1931.           lastScrollCount = scrollCount;
  1932.           lastWheel = dateNow();
  1933.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1934.         }, passiveCapture); // support contain => support passive
  1935.  
  1936.         document.addEventListener('mousedown', (evt) => {
  1937.           if (!evt || !evt.isTrusted) return;
  1938.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1939.           lastMouseDown = dateNow();
  1940.           currentMouseDown = true;
  1941.           lastUserInteraction = lastMouseDown;
  1942.         }, passiveCapture);
  1943.  
  1944.         document.addEventListener('pointerdown', (evt) => {
  1945.           if (!evt || !evt.isTrusted) return;
  1946.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1947.           lastMouseDown = dateNow();
  1948.           currentMouseDown = true;
  1949.           lastUserInteraction = lastMouseDown;
  1950.         }, passiveCapture);
  1951.  
  1952.         document.addEventListener('click', (evt) => {
  1953.           if (!evt || !evt.isTrusted) return;
  1954.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1955.           lastMouseDown = lastMouseUp = dateNow();
  1956.           currentMouseDown = false;
  1957.           lastUserInteraction = lastMouseDown;
  1958.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1959.         }, passiveCapture);
  1960.  
  1961.         document.addEventListener('tap', (evt) => {
  1962.           if (!evt || !evt.isTrusted) return;
  1963.           if (((evt || 0).target || 0).id !== 'item-scroller') return;
  1964.           lastMouseDown = lastMouseUp = dateNow();
  1965.           currentMouseDown = false;
  1966.           lastUserInteraction = lastMouseDown;
  1967.           delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1968.         }, passiveCapture);
  1969.  
  1970.  
  1971.         document.addEventListener('mouseup', (evt) => {
  1972.           if (!evt || !evt.isTrusted) return;
  1973.           if (currentMouseDown) {
  1974.             lastMouseUp = dateNow();
  1975.             currentMouseDown = false;
  1976.             lastUserInteraction = lastMouseUp;
  1977.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1978.           }
  1979.         }, passiveCapture);
  1980.  
  1981.  
  1982.         document.addEventListener('pointerup', (evt) => {
  1983.           if (!evt || !evt.isTrusted) return;
  1984.           if (currentMouseDown) {
  1985.             lastMouseUp = dateNow();
  1986.             currentMouseDown = false;
  1987.             lastUserInteraction = lastMouseUp;
  1988.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  1989.           }
  1990.         }, passiveCapture);
  1991.  
  1992.         document.addEventListener('touchstart', (evt) => {
  1993.           if (!evt || !evt.isTrusted) return;
  1994.           lastTouchDown = dateNow();
  1995.           currentTouchDown = true;
  1996.           lastUserInteraction = lastTouchDown;
  1997.         }, passiveCapture);
  1998.  
  1999.         document.addEventListener('touchmove', (evt) => {
  2000.           if (!evt || !evt.isTrusted) return;
  2001.           lastTouchDown = dateNow();
  2002.           currentTouchDown = true;
  2003.           lastUserInteraction = lastTouchDown;
  2004.         }, passiveCapture);
  2005.  
  2006.         document.addEventListener('touchend', (evt) => {
  2007.           if (!evt || !evt.isTrusted) return;
  2008.           if (currentTouchDown) {
  2009.             lastTouchUp = dateNow();
  2010.             currentTouchDown = false;
  2011.             lastUserInteraction = lastTouchUp;
  2012.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2013.           }
  2014.         }, passiveCapture);
  2015.  
  2016.         document.addEventListener('touchcancel', (evt) => {
  2017.           if (!evt || !evt.isTrusted) return;
  2018.           if (currentTouchDown) {
  2019.             lastTouchUp = dateNow();
  2020.             currentTouchDown = false;
  2021.             lastUserInteraction = lastTouchUp;
  2022.             delayFlushActiveItemsAfterUserActionK_ && delayFlushActiveItemsAfterUserActionK_();
  2023.           }
  2024.         }, passiveCapture);
  2025.  
  2026.  
  2027.       }
  2028.  
  2029.  
  2030.       const onRegistryReadyForDOMOperations = () => {
  2031.         let firstCheckedOnYtInit = false;
  2032.  
  2033.         const mightFirstCheckOnYtInit = () => {
  2034.           if (firstCheckedOnYtInit) return;
  2035.           firstCheckedOnYtInit = true;
  2036.  
  2037.           if (!document.body || !document.head) return;
  2038.  
  2039.           if (!assertor(() => location.pathname.startsWith('/live_chat') && location.search.indexOf('continuation=') >= 0)) return;
  2040.  
  2041.           addCssManaged();
  2042.  
  2043.           let efsContainer = document.getElementById('elzm-fonts-yk75g');
  2044.           if (efsContainer && efsContainer.parentNode !== document.body) {
  2045.             document.body.appendChild(efsContainer);
  2046.           }
  2047.  
  2048.  
  2049.         }
  2050.  
  2051.         if (!assertor(() => location.pathname.startsWith('/live_chat') && location.search.indexOf('continuation=') >= 0)) return;
  2052.         // if (!assertor(() => document.getElementById('yt-masthead') === null)) return;
  2053.  
  2054.         if (document.documentElement && document.head) {
  2055.  
  2056.           addCssManaged();
  2057.  
  2058.         }
  2059.         // console.log(document.body===null)
  2060.  
  2061.         customElements.whenDefined('yt-live-chat-item-list-renderer').then(() => {
  2062.  
  2063.  
  2064.           const tag = "yt-live-chat-item-list-renderer"
  2065.           const dummy = document.createElement(tag);
  2066.  
  2067.  
  2068.           const cProto = getProto(dummy);
  2069.           if (!cProto || !cProto.attached) {
  2070.             console.warn(`proto.attached for ${tag} is unavailable.`);
  2071.             return;
  2072.           }
  2073.  
  2074.  
  2075.           mightFirstCheckOnYtInit();
  2076.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-item-list-renderer hacks");
  2077.           console.log("[Begin]");
  2078.  
  2079.           const mclp = cProto;
  2080.           try {
  2081.             assertor(() => typeof mclp.scrollToBottom_ === 'function');
  2082.             assertor(() => typeof mclp.flushActiveItems_ === 'function');
  2083.             assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  2084.             assertor(() => typeof mclp.setAtBottom === 'function');
  2085.             assertor(() => typeof mclp.scrollToBottom66_ === 'undefined');
  2086.             assertor(() => typeof mclp.flushActiveItems66_ === 'undefined');
  2087.           } catch (e) { }
  2088.  
  2089.  
  2090.           try {
  2091.             assertor(() => typeof mclp.attached === 'function');
  2092.             assertor(() => typeof mclp.detached === 'function');
  2093.             assertor(() => typeof mclp.canScrollToBottom_ === 'function');
  2094.             assertor(() => typeof mclp.isSmoothScrollEnabled_ === 'function');
  2095.             assertor(() => typeof mclp.maybeResizeScrollContainer_ === 'function');
  2096.             assertor(() => typeof mclp.refreshOffsetContainerHeight_ === 'function');
  2097.             assertor(() => typeof mclp.smoothScroll_ === 'function');
  2098.             assertor(() => typeof mclp.resetSmoothScroll_ === 'function');
  2099.           } catch (e) { }
  2100.  
  2101.           mclp.__intermediate_delay__ = null;
  2102.  
  2103.           let mzk = 0;
  2104.           let myk = 0;
  2105.           let mlf = 0;
  2106.           let myw = 0;
  2107.           let mzt = 0;
  2108.           let zarr = null;
  2109.           let mlg = 0;
  2110.  
  2111.           if ((mclp.clearList || 0).length === 0) {
  2112.             assertor(() => fnIntegrity(mclp.clearList, '0.106.50'));
  2113.             mclp.clearList66 = mclp.clearList;
  2114.             mclp.clearList = function () {
  2115.               mzk++;
  2116.               myk++;
  2117.               mlf++;
  2118.               myw++;
  2119.               mzt++;
  2120.               mlg++;
  2121.               zarr = null;
  2122.               this.__intermediate_delay__ = null;
  2123.               this.clearList66();
  2124.             };
  2125.             console.log("clearList", "OK");
  2126.           } else {
  2127.             console.log("clearList", "NG");
  2128.           }
  2129.  
  2130.  
  2131.           let onListRendererAttachedDone = false;
  2132.  
  2133.           function setList(itemOffset, items) {
  2134.  
  2135.             const isFirstTime = onListRendererAttachedDone === false;
  2136.  
  2137.             if (isFirstTime) {
  2138.               onListRendererAttachedDone = true;
  2139.               Promise.resolve().then(watchUserCSS);
  2140.               addCssManaged();
  2141.               setupEvents();
  2142.             }
  2143.  
  2144.             setupStyle(itemOffset, items);
  2145.  
  2146.             setupMutObserver(items);
  2147.           }
  2148.  
  2149.           mclp.attached419 = async function () {
  2150.  
  2151.             if (!this.isAttached) return;
  2152.  
  2153.             let maxTrial = 16;
  2154.             while (!this.$ || !this.$['item-scroller'] || !this.$['item-offset'] || !this.$['items']) {
  2155.               if (--maxTrial < 0 || !this.isAttached) return;
  2156.               await new Promise(requestAnimationFrame);
  2157.             }
  2158.  
  2159.             if (this.isAttached !== true) return;
  2160.  
  2161.             if (!this.$) {
  2162.               console.warn("!this.$");
  2163.               return;
  2164.             }
  2165.             if (!this.$) return;
  2166.             /** @type {HTMLElement | null} */
  2167.             const itemScroller = this.$['item-scroller'];
  2168.             /** @type {HTMLElement | null} */
  2169.             const itemOffset = this.$['item-offset'];
  2170.             /** @type {HTMLElement | null} */
  2171.             const items = this.$['items'];
  2172.  
  2173.             if (!itemScroller || !itemOffset || !items) {
  2174.               console.warn("items.parentNode !== itemOffset");
  2175.               return;
  2176.             }
  2177.  
  2178.             if (nodeParent(items) !== itemOffset) {
  2179.  
  2180.               console.warn("items.parentNode !== itemOffset");
  2181.               return;
  2182.             }
  2183.  
  2184.  
  2185.             if (items.id !== 'items' || itemOffset.id !== "item-offset") {
  2186.  
  2187.               console.warn("id incorrect");
  2188.               return;
  2189.             }
  2190.  
  2191.             const isTargetItems = HTMLElement.prototype.matches.call(items, '#item-offset.style-scope.yt-live-chat-item-list-renderer > #items.style-scope.yt-live-chat-item-list-renderer')
  2192.  
  2193.             if (!isTargetItems) {
  2194.               console.warn("!isTargetItems");
  2195.               return;
  2196.             }
  2197.  
  2198.             setList(itemOffset, items);
  2199.  
  2200.           }
  2201.  
  2202.           mclp.attached331 = mclp.attached;
  2203.           mclp.attached = function () {
  2204.             this.attached419 && this.attached419();
  2205.             return this.attached331();
  2206.           }
  2207.  
  2208.           mclp.detached331 = mclp.detached;
  2209.  
  2210.           mclp.detached = function () {
  2211.             setupMutObserver();
  2212.             return this.detached331();
  2213.           }
  2214.  
  2215.           const t29s = document.querySelectorAll("yt-live-chat-item-list-renderer");
  2216.           for (const t29 of t29s) {
  2217.             if ((t29.inst || t29).isAttached === true) {
  2218.               t29.attached419();
  2219.             }
  2220.           }
  2221.  
  2222.           if ((mclp.async || 0).length === 2 && (mclp.cancelAsync || 0).length === 1) {
  2223.  
  2224.             assertor(() => fnIntegrity(mclp.async, '2.24.15'));
  2225.             assertor(() => fnIntegrity(mclp.cancelAsync, '1.15.8'));
  2226.  
  2227.             /** @type {Map<number, any>} */
  2228.             const aMap = new Map();
  2229.             let count = 6150;
  2230.             mclp.async66 = mclp.async;
  2231.             mclp.async = function (e, f) {
  2232.               // ensure the previous operation is done
  2233.               // .async is usually after the time consuming functions like flushActiveItems_ and scrollToBottom_
  2234.               const hasF = arguments.length === 2;
  2235.               const stack = new Error().stack;
  2236.               const isFlushAsync = stack.indexOf('flushActiveItems_') >= 0;
  2237.               if (count > 1e9) count = 6159;
  2238.               const resId = ++count;
  2239.               aMap.set(resId, e);
  2240.               (this.__intermediate_delay__ || Promise.resolve()).then(rk => {
  2241.                 const rp = aMap.get(resId);
  2242.                 if (typeof rp !== 'function') {
  2243.                   return;
  2244.                 }
  2245.                 let cancelCall = false;
  2246.                 if (isFlushAsync) {
  2247.                   if (rk < 0) {
  2248.                     cancelCall = true;
  2249.                   } else if (rk === 2 && arguments[0] === this.maybeScrollToBottom_) {
  2250.                     cancelCall = true;
  2251.                   }
  2252.                 }
  2253.                 if (cancelCall) {
  2254.                   aMap.delete(resId);
  2255.                 } else {
  2256.                   const asyncEn = function () {
  2257.                     aMap.delete(resId);
  2258.                     return rp.apply(this, arguments);
  2259.                   };
  2260.                   aMap.set(resId, hasF ? this.async66(asyncEn, f) : this.async66(asyncEn));
  2261.                 }
  2262.               });
  2263.  
  2264.               return resId;
  2265.             }
  2266.  
  2267.             mclp.cancelAsync66 = mclp.cancelAsync;
  2268.             mclp.cancelAsync = function (resId) {
  2269.               if (resId <= 6150) {
  2270.                 this.cancelAsync66(resId);
  2271.               } else if (aMap.has(resId)) {
  2272.                 const rp = aMap.get(resId);
  2273.                 aMap.delete(resId);
  2274.                 if (typeof rp !== 'function') {
  2275.                   this.cancelAsync66(rp);
  2276.                 }
  2277.               }
  2278.             }
  2279.  
  2280.             console.log("async", "OK");
  2281.           } else {
  2282.             console.log("async", "NG");
  2283.           }
  2284.  
  2285.  
  2286.           if ((mclp.showNewItems_ || 0).length === 0 && ENABLE_NO_SMOOTH_TRANSFORM) {
  2287.  
  2288.             assertor(() => fnIntegrity(mclp.showNewItems_, '0.170.79'));
  2289.             mclp.showNewItems66_ = mclp.showNewItems_;
  2290.  
  2291.             mclp.showNewItems77_ = async function () {
  2292.               if (myk > 1e9) myk = 9;
  2293.               let tid = ++myk;
  2294.  
  2295.               await new Promise(requestAnimationFrame);
  2296.  
  2297.               if (tid !== myk) {
  2298.                 return;
  2299.               }
  2300.  
  2301.               const cnt = this;
  2302.  
  2303.               await Promise.resolve();
  2304.               cnt.showNewItems66_();
  2305.  
  2306.               await Promise.resolve();
  2307.  
  2308.             }
  2309.  
  2310.             mclp.showNewItems_ = function () {
  2311.  
  2312.               const cnt = this;
  2313.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2314.                 cnt.showNewItems77_().then(() => {
  2315.                   resolve();
  2316.                 });
  2317.               });
  2318.             }
  2319.  
  2320.             console.log("showNewItems_", "OK");
  2321.           } else {
  2322.             console.log("showNewItems_", "NG");
  2323.           }
  2324.  
  2325.  
  2326.           if ((mclp.flushActiveItems_ || 0).length === 0) {
  2327.  
  2328.             assertor(() => fnIntegrity(mclp.flushActiveItems_, '0.137.81'));
  2329.  
  2330.             let hasMoreMessageState = !ENABLE_SHOW_MORE_BLINKER ? -1 : 0;
  2331.  
  2332.             let contensWillChangeController = null;
  2333.  
  2334.             mclp.flushActiveItems66_ = mclp.flushActiveItems_;
  2335.  
  2336.             mclp.flushActiveItems78_ = async function (tid) {
  2337.               try {
  2338.                 const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  2339.                 let logger = false;
  2340.                 const cnt = this;
  2341.                 let immd = cnt.__intermediate_delay__;
  2342.                 await new Promise(requestAnimationFrame);
  2343.  
  2344.                 if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2345.                 if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
  2346.  
  2347.                 mlf++;
  2348.                 if (mlg > 1e9) mlg = 9;
  2349.                 ++mlg;
  2350.  
  2351.                 const tmpMaxItemsCount = this.data.maxItemsToDisplay;
  2352.                 const reducedMaxItemsToDisplay = MAX_ITEMS_FOR_FULL_FLUSH;
  2353.                 let changeMaxItemsToDisplay = false;
  2354.                 const activeItemsLen = this.activeItems_.length;
  2355.                 if (activeItemsLen > tmpMaxItemsCount && tmpMaxItemsCount > 0) {
  2356.                   logger = true;
  2357.  
  2358.                   groupCollapsed("YouTube Super Fast Chat", " | flushActiveItems78_");
  2359.  
  2360.                   logger && console.log('[Begin]')
  2361.  
  2362.                   console.log('this.activeItems_.length > N', activeItemsLen, tmpMaxItemsCount);
  2363.                   if (ENABLE_REDUCED_MAXITEMS_FOR_FLUSH && lockedMaxItemsToDisplay === tmpMaxItemsCount && lockedMaxItemsToDisplay !== reducedMaxItemsToDisplay) {
  2364.                     console.log('reduce maxitems');
  2365.                     if (tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  2366.                       // as all the rendered chats are already "outdated"
  2367.                       // all old chats shall remove and reduced number of few chats will be rendered
  2368.                       // then restore to the original number
  2369.                       changeMaxItemsToDisplay = true;
  2370.                       this.data.maxItemsToDisplay = reducedMaxItemsToDisplay;
  2371.                       console.log(`'maxItemsToDisplay' is reduced from ${tmpMaxItemsCount} to ${reducedMaxItemsToDisplay}.`)
  2372.                     }
  2373.                     this.activeItems_.splice(0, activeItemsLen - this.data.maxItemsToDisplay);
  2374.                     //   console.log('changeMaxItemsToDisplay 01', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  2375.  
  2376.                     console.log('new this.activeItems_.length > N', this.activeItems_.length);
  2377.                   } else {
  2378.                     this.activeItems_.splice(0, activeItemsLen - (tmpMaxItemsCount < 900 ? tmpMaxItemsCount : 900));
  2379.  
  2380.                     console.log('new this.activeItems_.length > N', this.activeItems_.length);
  2381.                   }
  2382.                 }
  2383.                 // it is found that it will render all stacked chats after switching back from background
  2384.                 // to avoid lagging in popular livestream with massive chats, trim first before rendering.
  2385.                 // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
  2386.  
  2387.  
  2388.                 const items = (cnt.$ || 0).items;
  2389.  
  2390.                 if (USE_WILL_CHANGE_CONTROLLER) {
  2391.                   if (contensWillChangeController && contensWillChangeController.element !== items) {
  2392.                     contensWillChangeController.release();
  2393.                     contensWillChangeController = null;
  2394.                   }
  2395.                   if (!contensWillChangeController) contensWillChangeController = new WillChangeController(items, 'contents');
  2396.                 }
  2397.                 const wcController = contensWillChangeController;
  2398.                 cnt.__intermediate_delay__ = Promise.all([cnt.__intermediate_delay__ || null, immd || null]);
  2399.                 wcController && wcController.beforeOper();
  2400.                 await Promise.resolve();
  2401.                 const len1 = cnt.activeItems_.length;
  2402.                 cnt.flushActiveItems66_();
  2403.                 const len2 = cnt.activeItems_.length;
  2404.                 const bAsync = len1 !== len2;
  2405.                 await Promise.resolve();
  2406.                 if (wcController) {
  2407.                   if (bAsync) {
  2408.                     cnt.async(() => {
  2409.                       wcController.afterOper();
  2410.                     });
  2411.                   } else {
  2412.                     wcController.afterOper();
  2413.                   }
  2414.                 }
  2415.                 if (changeMaxItemsToDisplay && this.data.maxItemsToDisplay === reducedMaxItemsToDisplay && tmpMaxItemsCount > reducedMaxItemsToDisplay) {
  2416.                   this.data.maxItemsToDisplay = tmpMaxItemsCount;
  2417.  
  2418.                   logger && console.log(`'maxItemsToDisplay' is restored from ${reducedMaxItemsToDisplay} to ${tmpMaxItemsCount}.`);
  2419.                   //   console.log('changeMaxItemsToDisplay 02', this.data.maxItemsToDisplay, oMaxItemsToDisplay, reducedMaxItemsToDisplay)
  2420.                 } else if (changeMaxItemsToDisplay) {
  2421.  
  2422.                   logger && console.log(`'maxItemsToDisplay' cannot be restored`, {
  2423.                     maxItemsToDisplay: this.data.maxItemsToDisplay,
  2424.                     reducedMaxItemsToDisplay,
  2425.                     originalMaxItemsToDisplay: tmpMaxItemsCount
  2426.                   });
  2427.                 }
  2428.                 logger && console.log('[End]')
  2429.  
  2430.                 logger && console.groupEnd();
  2431.  
  2432.                 if (!ENABLE_NO_SMOOTH_TRANSFORM) {
  2433.  
  2434.  
  2435.                   const ff = () => {
  2436.  
  2437.                     if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2438.                     //   if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2439.                     if (!cnt.atBottom && cnt.allowScroll && cnt.hasUserJustInteracted11_ && !cnt.hasUserJustInteracted11_()) {
  2440.                       cnt.scrollToBottom_();
  2441.  
  2442.                       Promise.resolve().then(() => {
  2443.  
  2444.                         if (cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2445.                         if (!cnt.canScrollToBottom_()) cnt.scrollToBottom_();
  2446.                       });
  2447.  
  2448.  
  2449.                     }
  2450.                   }
  2451.  
  2452.                   ff();
  2453.  
  2454.  
  2455.                   Promise.resolve().then(ff);
  2456.  
  2457.                   // requestAnimationFrame(ff);
  2458.                 } else if (true) { // it might not be sticky to bottom when there is a full refresh.
  2459.  
  2460.                   const knt = cnt;
  2461.                   if (!scrollChatFn) {
  2462.                     const cnt = knt;
  2463.                     const f = () => {
  2464.                       const itemScroller = cnt.itemScroller;
  2465.                       if (!itemScroller || itemScroller.isConnected === false || cnt.isAttached === false) return;
  2466.                       if (!cnt.atBottom) {
  2467.                         cnt.scrollToBottom_();
  2468.                       } else if (itemScroller.scrollTop === 0) { // not yet interacted by user; cannot stick to bottom
  2469.                         itemScroller.scrollTop = itemScroller.scrollHeight;
  2470.                       }
  2471.                     };
  2472.                     scrollChatFn = () => Promise.resolve().then(f).then(f);
  2473.                   }
  2474.  
  2475.                   if (!ENABLE_FULL_RENDER_REQUIRED) scrollChatFn();
  2476.                 }
  2477.  
  2478.                 return 1;
  2479.  
  2480.  
  2481.               } catch (e) {
  2482.                 console.warn(e);
  2483.               }
  2484.             }
  2485.  
  2486.             mclp.flushActiveItems77_ = async function () {
  2487.               try {
  2488.  
  2489.                 const cnt = this;
  2490.                 if (mlf > 1e9) mlf = 9;
  2491.                 let tid = ++mlf;
  2492.                 if (tid !== mlf || cnt.isAttached === false || (cnt.hostElement || cnt).isConnected === false) return;
  2493.                 if (!cnt.activeItems_ || cnt.activeItems_.length === 0) return;
  2494.  
  2495.                 // 4 times to maxItems to avoid frequent trimming.
  2496.                 // 1 ... 10 ... 20 ... 30 ... 40 ... 50 ... 60 => 16 ... 20 ... 30 ..... 60 ... => 16
  2497.  
  2498.                 const lockedMaxItemsToDisplay = this.data.maxItemsToDisplay944;
  2499.                 this.activeItems_.length > lockedMaxItemsToDisplay * 4 && lockedMaxItemsToDisplay > 4 && this.activeItems_.splice(0, this.activeItems_.length - lockedMaxItemsToDisplay - 1);
  2500.                 if (cnt.canScrollToBottom_()) {
  2501.                   if (cnt.mutexPromiseFA77) await cnt.mutexPromiseFA77;
  2502.                   if (tid !== mlf) return;
  2503.                   let qResolve = null;
  2504.                   cnt.mutexPromiseFA77 = new Promise(resolve => { qResolve = resolve; })
  2505.                   let res;
  2506.                   try {
  2507.                     res = await cnt.flushActiveItems78_(tid);
  2508.                     if (hasMoreMessageState === 1) {
  2509.                       hasMoreMessageState = 0;
  2510.                       const showMore = cnt.$['show-more'];
  2511.                       if (showMore) {
  2512.                         showMore.classList.remove('has-new-messages-miuzp');
  2513.                       }
  2514.                     }
  2515.                   } catch (e) {
  2516.                     console.warn(e);
  2517.                   }
  2518.                   qResolve && qResolve();
  2519.                   return res;
  2520.                 } else {
  2521.                   if (hasMoreMessageState === 0) {
  2522.                     hasMoreMessageState = 1;
  2523.                     const showMore = cnt.$['show-more'];
  2524.                     if (showMore) {
  2525.                       showMore.classList.add('has-new-messages-miuzp');
  2526.                     }
  2527.                   }
  2528.                   // cnt.flushActiveItems66_();
  2529.                   // this.activeItems_.length > this.data.maxItemsToDisplay && this.activeItems_.splice(0, this.activeItems_.length - this.data.maxItemsToDisplay);
  2530.                   return 2;
  2531.                 }
  2532.               } catch (e) {
  2533.                 console.warn(e);
  2534.               }
  2535.             }
  2536.  
  2537.             mclp.flushActiveItems_ = function () {
  2538.               const cnt = this;
  2539.  
  2540.               if (arguments.length !== 0 || !cnt.activeItems_ || !cnt.canScrollToBottom_) return cnt.flushActiveItems66_.apply(this, arguments);
  2541.  
  2542.               if (cnt.activeItems_.length === 0) {
  2543.                 cnt.__intermediate_delay__ = null;
  2544.                 return;
  2545.               }
  2546.  
  2547.               const cntData = ((cnt || 0).data || 0);
  2548.               if (cntData.maxItemsToDisplay944 === undefined) {
  2549.                 cntData.maxItemsToDisplay944 = null;
  2550.                 if (cntData.maxItemsToDisplay > MAX_ITEMS_FOR_TOTAL_DISPLAY) cntData.maxItemsToDisplay = MAX_ITEMS_FOR_TOTAL_DISPLAY;
  2551.                 cntData.maxItemsToDisplay944 = cntData.maxItemsToDisplay || null;
  2552.               }
  2553.  
  2554.               // ignore previous __intermediate_delay__ and create a new one
  2555.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2556.                 cnt.flushActiveItems77_().then(rt => {
  2557.                   if (rt === 1) resolve(1); // success, scroll to bottom
  2558.                   else if (rt === 2) resolve(2); // success, trim
  2559.                   else resolve(-1); // skip
  2560.                 });
  2561.               });
  2562.  
  2563.             }
  2564.             console.log("flushActiveItems_", "OK");
  2565.           } else {
  2566.             console.log("flushActiveItems_", "NG");
  2567.           }
  2568.  
  2569.           mclp.delayFlushActiveItemsAfterUserAction11_ = async function () {
  2570.             try {
  2571.               if (mlg > 1e9) mlg = 9;
  2572.               const tid = ++mlg;
  2573.               const keepTrialCond = () => this.atBottom && this.allowScroll && (tid === mlg) && this.isAttached === true && this.activeItems_.length >= 1 && (this.hostElement || 0).isConnected === true;
  2574.               const runCond = () => this.canScrollToBottom_();
  2575.               if (!keepTrialCond()) return;
  2576.               if (runCond()) return this.flushActiveItems_() | 1; // avoid return promise
  2577.               await new Promise(r => setTimeout(r, 80));
  2578.               if (!keepTrialCond()) return;
  2579.               if (runCond()) return this.flushActiveItems_() | 1;
  2580.               await new Promise(requestAnimationFrame);
  2581.               if (runCond()) return this.flushActiveItems_() | 1;
  2582.             } catch (e) {
  2583.               console.warn(e);
  2584.             }
  2585.           }
  2586.  
  2587.           if ((mclp.atBottomChanged_ || 0).length === 1) {
  2588.             // note: if the scrolling is too frequent, the show more visibility might get wrong.
  2589.             assertor(() => fnIntegrity(mclp.atBottomChanged_, '1.75.39'));
  2590.  
  2591.             const querySelector = HTMLElement.prototype.querySelector;
  2592.             const U = (element) => ({
  2593.               querySelector: (selector) => querySelector.call(element, selector)
  2594.             });
  2595.  
  2596.             let qid = 0;
  2597.             mclp.atBottomChanged_ = function (a) {
  2598.               let tid = ++qid;
  2599.               var b = this;
  2600.               a ? this.hideShowMoreAsync_ || (this.hideShowMoreAsync_ = this.async(function () {
  2601.                 if (tid !== qid) return;
  2602.                 U(b.hostElement).querySelector("#show-more").style.visibility = "hidden"
  2603.               }, 200)) : (this.hideShowMoreAsync_ && this.cancelAsync(this.hideShowMoreAsync_),
  2604.                 this.hideShowMoreAsync_ = null,
  2605.                 U(this.hostElement).querySelector("#show-more").style.visibility = "visible")
  2606.             }
  2607.  
  2608.             console.log("atBottomChanged_", "OK");
  2609.           } else {
  2610.             console.log("atBottomChanged_", "NG");
  2611.           }
  2612.  
  2613.           if ((mclp.onScrollItems_ || 0).length === 1) {
  2614.  
  2615.             assertor(() => fnIntegrity(mclp.onScrollItems_, '1.17.9'));
  2616.             mclp.onScrollItems66_ = mclp.onScrollItems_;
  2617.             mclp.onScrollItems77_ = async function (evt) {
  2618.               if (myw > 1e9) myw = 9;
  2619.               let tid = ++myw;
  2620.  
  2621.               await new Promise(requestAnimationFrame);
  2622.  
  2623.               if (tid !== myw) {
  2624.                 return;
  2625.               }
  2626.  
  2627.               const cnt = this;
  2628.  
  2629.               await Promise.resolve();
  2630.               if (USE_OPTIMIZED_ON_SCROLL_ITEMS) {
  2631.                 await Promise.resolve().then(() => {
  2632.                   this.ytRendererBehavior.onScroll(evt);
  2633.                 }).then(() => {
  2634.                   if (this.canScrollToBottom_()) {
  2635.                     const hasUserJustInteracted = this.hasUserJustInteracted11_ ? this.hasUserJustInteracted11_() : true;
  2636.                     if (hasUserJustInteracted) {
  2637.                       // only when there is an user action
  2638.                       this.setAtBottom();
  2639.                       return 1;
  2640.                     }
  2641.                   } else {
  2642.                     // no message inserting
  2643.                     this.setAtBottom();
  2644.                     return 1;
  2645.                   }
  2646.                 }).then((r) => {
  2647.  
  2648.                   if (this.activeItems_.length) {
  2649.  
  2650.                     if (this.canScrollToBottom_()) {
  2651.                       this.flushActiveItems_();
  2652.                       return 1 && r;
  2653.                     } else if (this.atBottom && this.allowScroll && (this.hasUserJustInteracted11_ && this.hasUserJustInteracted11_())) {
  2654.                       // delayed due to user action
  2655.                       this.delayFlushActiveItemsAfterUserAction11_ && this.delayFlushActiveItemsAfterUserAction11_();
  2656.                       return 0;
  2657.                     }
  2658.                   }
  2659.                 }).then((r) => {
  2660.                   if (r) {
  2661.                     // ensure setAtBottom is correctly set
  2662.                     this.setAtBottom();
  2663.                   }
  2664.                 });
  2665.               } else {
  2666.                 cnt.onScrollItems66_(evt);
  2667.               }
  2668.  
  2669.               await Promise.resolve();
  2670.  
  2671.             }
  2672.  
  2673.             mclp.onScrollItems_ = function (evt) {
  2674.  
  2675.               const cnt = this;
  2676.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2677.                 cnt.onScrollItems77_(evt).then(() => {
  2678.                   resolve();
  2679.                 });
  2680.               });
  2681.             }
  2682.             console.log("onScrollItems_", "OK");
  2683.           } else {
  2684.             console.log("onScrollItems_", "NG");
  2685.           }
  2686.  
  2687.           if ((mclp.handleLiveChatActions_ || 0).length === 1) {
  2688.  
  2689.             assertor(() => fnIntegrity(mclp.handleLiveChatActions_, '1.31.17'));
  2690.             mclp.handleLiveChatActions66_ = mclp.handleLiveChatActions_;
  2691.  
  2692.             mclp.handleLiveChatActions77_ = async function (arr) {
  2693.               if (typeof (arr || 0).length !== 'number') {
  2694.                 this.handleLiveChatActions66_(arr);
  2695.                 return;
  2696.               }
  2697.               if (mzt > 1e9) mzt = 9;
  2698.               let tid = ++mzt;
  2699.  
  2700.               if (zarr === null) zarr = arr;
  2701.               else Array.prototype.push.apply(zarr, arr);
  2702.               arr = null;
  2703.  
  2704.               await new Promise(requestAnimationFrame);
  2705.  
  2706.               if (tid !== mzt || zarr === null) {
  2707.                 return;
  2708.               }
  2709.  
  2710.               const carr = zarr;
  2711.               zarr = null;
  2712.  
  2713.               await Promise.resolve();
  2714.               this.handleLiveChatActions66_(carr);
  2715.               await Promise.resolve();
  2716.  
  2717.             }
  2718.  
  2719.             mclp.handleLiveChatActions_ = function (arr) {
  2720.  
  2721.               const cnt = this;
  2722.               cnt.__intermediate_delay__ = new Promise(resolve => {
  2723.                 cnt.handleLiveChatActions77_(arr).then(() => {
  2724.                   resolve();
  2725.                 });
  2726.               });
  2727.             }
  2728.             console.log("handleLiveChatActions_", "OK");
  2729.           } else {
  2730.             console.log("handleLiveChatActions_", "NG");
  2731.           }
  2732.  
  2733.           mclp.hasUserJustInteracted11_ = () => {
  2734.             const t = dateNow();
  2735.             return (t - lastWheel < 80) || currentMouseDown || currentTouchDown || (t - lastUserInteraction < 80);
  2736.           }
  2737.  
  2738.           if ((mclp.canScrollToBottom_ || 0).length === 0) {
  2739.  
  2740.             assertor(() => fnIntegrity(mclp.canScrollToBottom_, '0.9.5'));
  2741.  
  2742.             mclp.canScrollToBottom_ = function () {
  2743.               return this.atBottom && this.allowScroll && !this.hasUserJustInteracted11_();
  2744.             }
  2745.  
  2746.             console.log("canScrollToBottom_", "OK");
  2747.           } else {
  2748.             console.log("canScrollToBottom_", "NG");
  2749.           }
  2750.  
  2751.           if (ENABLE_NO_SMOOTH_TRANSFORM) {
  2752.  
  2753.             mclp.isSmoothScrollEnabled_ = function () {
  2754.               return false;
  2755.             }
  2756.  
  2757.             mclp.maybeResizeScrollContainer_ = function () {
  2758.               //
  2759.             }
  2760.  
  2761.             mclp.refreshOffsetContainerHeight_ = function () {
  2762.               //
  2763.             }
  2764.  
  2765.             mclp.smoothScroll_ = function () {
  2766.               //
  2767.             }
  2768.  
  2769.             mclp.resetSmoothScroll_ = function () {
  2770.               //
  2771.             }
  2772.             console.log("ENABLE_NO_SMOOTH_TRANSFORM", "OK");
  2773.           } else {
  2774.             console.log("ENABLE_NO_SMOOTH_TRANSFORM", "NG");
  2775.           }
  2776.  
  2777.           console.log("[End]");
  2778.           console.groupEnd();
  2779.  
  2780.         });
  2781.  
  2782.  
  2783.         const tickerContainerSetAttribute = function (attrName, attrValue) { // ensure '14.30000001%'.toFixed(1)
  2784.  
  2785.           let yd = (this.__dataHost || (this.inst || 0).__dataHost || 0).__data;
  2786.  
  2787.           if (arguments.length === 2 && attrName === 'style' && yd && attrValue) {
  2788.  
  2789.             // let v = yd.containerStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_;
  2790.             let v = `${attrValue}`;
  2791.             // conside a ticker is 101px width
  2792.             // 1% = 1.01px
  2793.             // 0.2% = 0.202px
  2794.  
  2795.  
  2796.             const ratio1 = (yd.ratio * 100);
  2797.             if (ratio1 > -1) { // avoid NaN
  2798.  
  2799.               // countdownDurationMs
  2800.               // 600000 - 0.2%    <1% = 6s>  <0.2% = 1.2s>
  2801.               // 300000 - 0.5%    <1% = 3s>  <0.5% = 1.5s>
  2802.               // 150000 - 1%    <1% = 1.5s>
  2803.               // 75000 - 2%    <1% =0.75s > <2% = 1.5s>
  2804.               // 30000 - 5%    <1% =0.3s > <5% = 1.5s>
  2805.  
  2806.               // 99px * 5% = 4.95px
  2807.  
  2808.               // 15000 - 10%    <1% =0.15s > <10% = 1.5s>
  2809.  
  2810.  
  2811.               // 1% Duration
  2812.  
  2813.               let ratio2 = ratio1;
  2814.  
  2815.               const ydd = yd.data;
  2816.               const d1 = ydd.durationSec;
  2817.               const d2 = ydd.fullDurationSec;
  2818.  
  2819.               if (d1 === d2 && d1 > 1) {
  2820.  
  2821.                 if (d1 > 400) ratio2 = Math.round(ratio2 * 5) / 5; // 0.2%
  2822.                 else if (d1 > 200) ratio2 = Math.round(ratio2 * 2) / 2; // 0.5%
  2823.                 else if (d1 > 100) ratio2 = Math.round(ratio2 * 1) / 1; // 1%
  2824.                 else if (d1 > 50) ratio2 = Math.round(ratio2 * 0.5) / 0.5; // 2%
  2825.                 else if (d1 > 25) ratio2 = Math.round(ratio2 * 0.2) / 0.2; // 5% (max => 99px * 5% = 4.95px)
  2826.                 else ratio2 = Math.round(ratio2 * 0.2) / 0.2;
  2827.  
  2828.               } else {
  2829.                 ratio2 = Math.round(ratio2 * 5) / 5; // 0.2% (min)
  2830.               }
  2831.  
  2832.               // ratio2 = Math.round(ratio2 * 5) / 5;
  2833.               ratio2 = ratio2.toFixed(1);
  2834.               v = v.replace(`${ratio1}%`, `${ratio2}%`).replace(`${ratio1}%`, `${ratio2}%`);
  2835.  
  2836.               if (yd.__style_last__ === v) return;
  2837.               yd.__style_last__ = v;
  2838.               // do not consider any delay here.
  2839.               // it shall be inside the looping for all properties changes. all the css background ops are in the same microtask.
  2840.  
  2841.             }
  2842.  
  2843.             HTMLElement.prototype.setAttribute.call(dr(this), attrName, v);
  2844.  
  2845.  
  2846.           } else {
  2847.             HTMLElement.prototype.setAttribute.apply(dr(this), arguments);
  2848.           }
  2849.  
  2850.         };
  2851.  
  2852.  
  2853.         const fpTicker = (renderer) => {
  2854.           const cnt = renderer.inst || renderer;
  2855.           assertor(() => typeof (cnt || 0).is === 'string');
  2856.           assertor(() => ((cnt || 0).hostElement || 0).nodeType === 1);
  2857.           const container = (cnt.$ || 0).container;
  2858.           if (container) {
  2859.             assertor(() => (container || 0).nodeType === 1);
  2860.             assertor(() => typeof container.setAttribute === 'function');
  2861.             container.setAttribute = tickerContainerSetAttribute;
  2862.           } else {
  2863.             console.warn(`"container" does not exist in ${cnt.is}`);
  2864.           }
  2865.         };
  2866.  
  2867.         const tags = ["yt-live-chat-ticker-paid-message-item-renderer", "yt-live-chat-ticker-paid-sticker-item-renderer",
  2868.           "yt-live-chat-ticker-renderer", "yt-live-chat-ticker-sponsor-item-renderer"];
  2869.  
  2870.  
  2871.         Promise.all(tags.map(tag => customElements.whenDefined(tag))).then(() => {
  2872.  
  2873.           mightFirstCheckOnYtInit();
  2874.           groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-ticker-... hacks");
  2875.           console.log("[Begin]");
  2876.  
  2877.           for (const tag of tags) {
  2878.             const dummy = document.createElement(tag);
  2879.  
  2880.             const cProto = getProto(dummy);
  2881.             if (!cProto || !cProto.attached) {
  2882.               console.warn(`proto.attached for ${tag} is unavailable.`);
  2883.               continue;
  2884.             }
  2885.  
  2886.             cProto.attached77 = cProto.attached;
  2887.  
  2888.             cProto.attached = function () {
  2889.               fpTicker(this.hostElement || this);
  2890.               return this.attached77();
  2891.             }
  2892.  
  2893.             for (const elm of document.getElementsByTagName(tag)) {
  2894.               if ((elm || elm.inst).isAttached === true) {
  2895.                 fpTicker(elm);
  2896.               }
  2897.             }
  2898.  
  2899.             if (ENABLE_RAF_HACK_TICKERS && rafHub !== null) {
  2900.  
  2901.               // cancelable - this.rafId < isAnimationPausedChanged >
  2902.  
  2903.               let doHack = false;
  2904.  
  2905.               if (typeof cProto.startCountdown === 'function' && typeof cProto.updateTimeout === 'function' && typeof cProto.isAnimationPausedChanged === 'function') {
  2906.  
  2907.                 console.log('startCountdown', typeof cProto.startCountdown)
  2908.                 console.log('updateTimeout', typeof cProto.updateTimeout)
  2909.                 console.log('isAnimationPausedChanged', typeof cProto.isAnimationPausedChanged)
  2910.  
  2911.                 doHack = fnIntegrity(cProto.startCountdown, '2.66.37') && fnIntegrity(cProto.updateTimeout, '1.76.45') && fnIntegrity(cProto.isAnimationPausedChanged, '2.56.30')
  2912.  
  2913.               }
  2914.               if (doHack) {
  2915.  
  2916.                 cProto.startCountdown = function (a, b) {
  2917.                   // console.log('cProto.startCountdown', tag) // yt-live-chat-ticker-sponsor-item-renderer
  2918.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2919.                   b = void 0 === b ? 0 : b;
  2920.                   void 0 !== a && (this.countdownMs = 1E3 * a,
  2921.                     this.countdownDurationMs = b ? 1E3 * b : this.countdownMs,
  2922.                     this.ratio = 1,
  2923.                     this.lastCountdownTimeMs || this.isAnimationPaused || (this.lastCountdownTimeMs = performance.now(),
  2924.                       this.rafId = rafHub.request(this.boundUpdateTimeout37_)))
  2925.                 };
  2926.  
  2927.                 cProto.updateTimeout = function (a) {
  2928.                   // console.log('cProto.updateTimeout', tag) // yt-live-chat-ticker-sponsor-item-renderer
  2929.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2930.                   this.countdownMs = Math.max(0, this.countdownMs - (a - (this.lastCountdownTimeMs || 0)));
  2931.                   this.ratio = this.countdownMs / this.countdownDurationMs;
  2932.                   this.isAttached && this.countdownMs ? (this.lastCountdownTimeMs = a,
  2933.                     this.rafId = rafHub.request(this.boundUpdateTimeout37_)) : (this.lastCountdownTimeMs = null,
  2934.                       this.isAttached && ("auto" === this.hostElement.style.width && this.setContainerWidth(),
  2935.                         this.slideDown()))
  2936.                 };
  2937.  
  2938.                 cProto.isAnimationPausedChanged = function (a, b) {
  2939.                   if (!this.boundUpdateTimeout37_) this.boundUpdateTimeout37_ = this.updateTimeout.bind(this);
  2940.                   a ? rafHub.cancel(this.rafId) : !a && b && (a = this.lastCountdownTimeMs || 0,
  2941.                     this.detlaSincePausedSecs && (a = (this.lastCountdownTimeMs || 0) + 1E3 * this.detlaSincePausedSecs,
  2942.                       this.detlaSincePausedSecs = 0),
  2943.                     this.boundUpdateTimeout37_(a),
  2944.                     this.lastCountdownTimeMs = window.performance.now())
  2945.                 };
  2946.  
  2947.                 console.log('RAF_HACK_TICKERS', tag, "OK")
  2948.               } else if (tag === 'yt-live-chat-ticker-renderer') {
  2949.  
  2950.                 // no timer function to be set on yt-live-chat-ticker-renderer
  2951.  
  2952.               } else {
  2953.  
  2954.                 console.log('RAF_HACK_TICKERS', tag, "NG")
  2955.               }
  2956.  
  2957.             }
  2958.  
  2959.           }
  2960.           console.log("[End]");
  2961.           console.groupEnd();
  2962.  
  2963.  
  2964.         })
  2965.  
  2966.  
  2967.         if (ENABLE_RAF_HACK_INPUT_RENDERER && rafHub !== null) {
  2968.  
  2969.  
  2970.           customElements.whenDefined("yt-live-chat-message-input-renderer").then(() => {
  2971.  
  2972.             mightFirstCheckOnYtInit();
  2973.             groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-message-input-renderer hacks");
  2974.             console.log("[Begin]");
  2975.             (() => {
  2976.  
  2977.               const tag = "yt-live-chat-message-input-renderer"
  2978.               const dummy = document.createElement(tag);
  2979.  
  2980.               const cProto = getProto(dummy);
  2981.               if (!cProto || !cProto.attached) {
  2982.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  2983.                 return;
  2984.               }
  2985.  
  2986.               let doHack = false;
  2987.               if (typeof cProto.handleTimeout === 'function' && typeof cProto.updateTimeout === 'function') {
  2988.  
  2989.                 // not cancellable
  2990.                 console.log('handleTimeout', typeof cProto.handleTimeout)
  2991.                 console.log('updateTimeout', typeof cProto.updateTimeout)
  2992.  
  2993.                 doHack = fnIntegrity(cProto.handleTimeout, '1.27.16') && fnIntegrity(cProto.updateTimeout, '1.50.33');
  2994.  
  2995.               }
  2996.  
  2997.               if (doHack) {
  2998.  
  2999.                 cProto.handleTimeout = function (a) {
  3000.                   console.log('cProto.handleTimeout', tag)
  3001.                   if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  3002.                   this.timeoutDurationMs = this.timeoutMs = a;
  3003.                   this.countdownRatio = 1;
  3004.                   0 === this.lastTimeoutTimeMs && rafHub.request(this.boundUpdateTimeout38_)
  3005.                 };
  3006.                 cProto.updateTimeout = function (a) {
  3007.                   console.log('cProto.updateTimeout', tag)
  3008.                   if (!this.boundUpdateTimeout38_) this.boundUpdateTimeout38_ = this.updateTimeout.bind(this);
  3009.                   this.lastTimeoutTimeMs && (this.timeoutMs = Math.max(0, this.timeoutMs - (a - this.lastTimeoutTimeMs)),
  3010.                     this.countdownRatio = this.timeoutMs / this.timeoutDurationMs);
  3011.                   this.isAttached && this.timeoutMs ? (this.lastTimeoutTimeMs = a,
  3012.                     rafHub.request(this.boundUpdateTimeout38_)) : this.lastTimeoutTimeMs = 0
  3013.                 };
  3014.  
  3015.                 console.log('RAF_HACK_INPUT_RENDERER', tag, "OK")
  3016.               } else {
  3017.  
  3018.                 console.log('RAF_HACK_INPUT_RENDERER', tag, "NG")
  3019.               }
  3020.  
  3021.             })();
  3022.  
  3023.             console.log("[End]");
  3024.  
  3025.             console.groupEnd();
  3026.  
  3027.  
  3028.           })
  3029.  
  3030.  
  3031.         }
  3032.  
  3033.         if (ENABLE_RAF_HACK_EMOJI_PICKER && rafHub !== null) {
  3034.  
  3035.  
  3036.           customElements.whenDefined("yt-emoji-picker-renderer").then(() => {
  3037.  
  3038.             mightFirstCheckOnYtInit();
  3039.             groupCollapsed("YouTube Super Fast Chat", " | yt-emoji-picker-renderer hacks");
  3040.             console.log("[Begin]");
  3041.             (() => {
  3042.  
  3043.               const tag = "yt-emoji-picker-renderer"
  3044.               const dummy = document.createElement(tag);
  3045.  
  3046.               const cProto = getProto(dummy);
  3047.               if (!cProto || !cProto.attached) {
  3048.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  3049.                 return;
  3050.               }
  3051.  
  3052.               let doHack = false;
  3053.               if (typeof cProto.animateScroll_ === 'function') {
  3054.  
  3055.                 // not cancellable
  3056.                 console.log('animateScroll_', typeof cProto.animateScroll_)
  3057.  
  3058.                 doHack = fnIntegrity(cProto.animateScroll_, '1.102.49')
  3059.  
  3060.               }
  3061.  
  3062.               if (doHack) {
  3063.  
  3064.                 const querySelector = HTMLElement.prototype.querySelector;
  3065.                 const U = (element) => ({
  3066.                   querySelector: (selector) => querySelector.call(element, selector)
  3067.                 });
  3068.  
  3069.                 cProto.animateScroll_ = function (a) {
  3070.                   // console.log('cProto.animateScroll_', tag) // yt-emoji-picker-renderer
  3071.                   if (!this.boundAnimateScroll39_) this.boundAnimateScroll39_ = this.animateScroll_.bind(this);
  3072.                   this.lastAnimationTime_ || (this.lastAnimationTime_ = a);
  3073.                   a -= this.lastAnimationTime_;
  3074.                   200 > a ? (U(this.hostElement).querySelector("#categories").scrollTop = this.animationStart_ + (this.animationEnd_ - this.animationStart_) * a / 200,
  3075.                     rafHub.request(this.boundAnimateScroll39_)) : (null != this.animationEnd_ && (U(this.hostElement).querySelector("#categories").scrollTop = this.animationEnd_),
  3076.                       this.animationEnd_ = this.animationStart_ = null,
  3077.                       this.lastAnimationTime_ = 0);
  3078.                   this.updateButtons_()
  3079.                 }
  3080.  
  3081.                 console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "OK")
  3082.               } else {
  3083.  
  3084.                 console.log('ENABLE_RAF_HACK_EMOJI_PICKER', tag, "NG")
  3085.               }
  3086.  
  3087.             })();
  3088.  
  3089.             console.log("[End]");
  3090.  
  3091.             console.groupEnd();
  3092.           });
  3093.         }
  3094.  
  3095.         if (ENABLE_RAF_HACK_DOCKED_MESSAGE && rafHub !== null) {
  3096.  
  3097.  
  3098.           customElements.whenDefined("yt-live-chat-docked-message").then(() => {
  3099.  
  3100.             mightFirstCheckOnYtInit();
  3101.             groupCollapsed("YouTube Super Fast Chat", " | yt-live-chat-docked-message hacks");
  3102.             console.log("[Begin]");
  3103.             (() => {
  3104.  
  3105.               const tag = "yt-live-chat-docked-message"
  3106.               const dummy = document.createElement(tag);
  3107.  
  3108.               const cProto = getProto(dummy);
  3109.               if (!cProto || !cProto.attached) {
  3110.                 console.warn(`proto.attached for ${tag} is unavailable.`);
  3111.                 return;
  3112.               }
  3113.  
  3114.               let doHack = false;
  3115.               if (typeof cProto.detached === 'function' && typeof cProto.checkIntersections === 'function' && typeof cProto.onDockableMessagesChanged === 'function' && typeof cProto.boundCheckIntersections === 'undefined') {
  3116.  
  3117.                 // cancelable - this.intersectRAF <detached>
  3118.                 // yt-live-chat-docked-message
  3119.                 // boundCheckIntersections <-> checkIntersections
  3120.                 // onDockableMessagesChanged
  3121.                 //  this.intersectRAF = window.requestAnimationFrame(this.boundCheckIntersections);
  3122.  
  3123.                 console.log('detached', typeof cProto.detached)
  3124.                 console.log('checkIntersections', typeof cProto.checkIntersections)
  3125.                 console.log('onDockableMessagesChanged', typeof cProto.onDockableMessagesChanged)
  3126.  
  3127.                 doHack = fnIntegrity(cProto.detached, '0.32.22') && fnIntegrity(cProto.checkIntersections, '0.128.85') && fnIntegrity(cProto.onDockableMessagesChanged, '0.20.11')
  3128.  
  3129.               }
  3130.  
  3131.               if (doHack) {
  3132.  
  3133.                 cProto.checkIntersections = function () {
  3134.                   console.log('cProto.checkIntersections', tag)
  3135.                   if (this.dockableMessages.length) {
  3136.                     this.intersectRAF = rafHub.request(this.boundCheckIntersections);
  3137.                     var a = this.dockableMessages[0]
  3138.                       , b = this.hostElement.getBoundingClientRect();
  3139.                     a = a.getBoundingClientRect();
  3140.                     var c = a.top - b.top
  3141.                       , d = 8 >= c;
  3142.                     c = 8 >= c - this.hostElement.clientHeight;
  3143.                     if (d) {
  3144.                       for (var e; d;) {
  3145.                         e = this.dockableMessages.shift();
  3146.                         d = this.dockableMessages[0];
  3147.                         if (!d)
  3148.                           break;
  3149.                         d = d.getBoundingClientRect();
  3150.                         c = d.top - b.top;
  3151.                         var f = 8 >= c;
  3152.                         if (8 >= c - a.height)
  3153.                           if (f)
  3154.                             a = d;
  3155.                           else
  3156.                             return;
  3157.                         d = f
  3158.                       }
  3159.                       this.dock(e)
  3160.                     } else
  3161.                       c && this.dockedItem && this.clear()
  3162.                   } else
  3163.                     this.intersectRAF = 0
  3164.                 }
  3165.  
  3166.                 cProto.onDockableMessagesChanged = function () {
  3167.                   // console.log('cProto.onDockableMessagesChanged', tag) // yt-live-chat-docked-message
  3168.                   this.dockableMessages.length && !this.intersectRAF && (this.intersectRAF = rafHub.request(this.boundCheckIntersections))
  3169.                 }
  3170.  
  3171.                 cProto.detached = function () {
  3172.                   this.intersectRAF && rafHub.cancel(this.intersectRAF)
  3173.                 }
  3174.  
  3175.                 console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "OK")
  3176.               } else {
  3177.  
  3178.                 console.log('ENABLE_RAF_HACK_DOCKED_MESSAGE', tag, "NG")
  3179.               }
  3180.  
  3181.             })();
  3182.  
  3183.             console.log("[End]");
  3184.  
  3185.             console.groupEnd();
  3186.  
  3187.           });
  3188.  
  3189.         }
  3190.  
  3191.  
  3192.       }
  3193.  
  3194.       promiseForCustomYtElementsReady.then(onRegistryReadyForDOMOperations);
  3195.  
  3196.  
  3197.     })();
  3198.  
  3199.  
  3200.   });
  3201.  
  3202. })({ IntersectionObserver });