☰

Tabview Youtube

Make comments and lists into tabs

当前为 2021-07-03 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Tabview Youtube
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.6
  5. // @description  Make comments and lists into tabs
  6. // @author       CY Fung
  7. // @match        https://www.youtube.com/watch?v=*
  8. // @resource     contentCSS https://raw.githubusercontent.com/cyfung1031/Tabview-Youtube/b57d5c149caf4b78df3eeb0b9a791af8347d97cb/css/style_content.css
  9. // @icon         https://github.com/cyfung1031/Tabview-Youtube/raw/main/images/icon128p.png
  10. // @require      https://code.jquery.com/jquery-3.6.0.slim.min.js
  11. // @grant        GM_getResourceText
  12. // @run-at       document-start
  13. // @license      MIT https://github.com/cyfung1031/Tabview-Youtube/blob/main/LICENSE
  14. // ==/UserScript==
  15. function main($){
  16.     // MIT License
  17.     // https://github.com/cyfung1031/Tabview-Youtube/raw/main/js/content.js
  18.  
  19.  
  20.  
  21.  
  22.  
  23. /**
  24.  * SVG resources:
  25.  * <div>Icons made by <a href="https://www.flaticon.com/authors/smashicons" title="Smashicons">Smashicons</a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com</a></div>
  26.  */
  27.  
  28. const scriptVersionForExternal = '2021/07/03';
  29.  
  30.  const svgComments = `
  31.  <path d="M40.068,13.465L5.93,13.535c-3.27,0-5.93,2.66-5.93,5.93v21.141c0,3.27,2.66,5.929,5.93,5.929H12v10
  32.  c0,0.413,0.254,0.784,0.64,0.933c0.117,0.045,0.239,0.067,0.36,0.067c0.276,0,0.547-0.115,0.74-0.327l9.704-10.675l16.626-0.068
  33.  c3.27,0,5.93-2.66,5.93-5.929V19.395C46,16.125,43.34,13.465,40.068,13.465z M10,23.465h13c0.553,0,1,0.448,1,1s-0.447,1-1,1H10
  34.  c-0.553,0-1-0.448-1-1S9.447,23.465,10,23.465z M36,37.465H10c-0.553,0-1-0.448-1-1s0.447-1,1-1h26c0.553,0,1,0.448,1,1
  35.  S36.553,37.465,36,37.465z M36,31.465H10c-0.553,0-1-0.448-1-1s0.447-1,1-1h26c0.553,0,1,0.448,1,1S36.553,31.465,36,31.465z"/>
  36.  <path d="M54.072,2.535L19.93,2.465c-3.27,0-5.93,2.66-5.93,5.93v3.124l26.064-0.054c4.377,0,7.936,3.557,7.936,7.93v21.07v0.071
  37.  v2.087l3.26,3.586c0.193,0.212,0.464,0.327,0.74,0.327c0.121,0,0.243-0.022,0.36-0.067c0.386-0.149,0.64-0.52,0.64-0.933v-10h1.07
  38.  c3.27,0,5.93-2.66,5.93-5.929V8.465C60,5.195,57.34,2.535,54.072,2.535z"/>
  39.  `
  40.  
  41. const svgVideos = `<path d="M298,33c0-13.255-10.745-24-24-24H24C10.745,9,0,19.745,0,33v232c0,13.255,10.745,24,24,24h250c13.255,0,24-10.745,24-24V33
  42.  z M91,39h43v34H91V39z M61,259H30v-34h31V259z M61,73H30V39h31V73z M134,259H91v-34h43V259z M123,176.708v-55.417
  43.  c0-8.25,5.868-11.302,12.77-6.783l40.237,26.272c6.902,4.519,6.958,11.914,0.056,16.434l-40.321,26.277
  44.  C128.84,188.011,123,184.958,123,176.708z M207,259h-43v-34h43V259z M207,73h-43V39h43V73z M268,259h-31v-34h31V259z M268,73h-31V39
  45.  h31V73z"/>`
  46.  
  47. const svgInfo = `<path d="M11.812,0C5.289,0,0,5.289,0,11.812s5.289,11.813,11.812,11.813s11.813-5.29,11.813-11.813
  48.  S18.335,0,11.812,0z M14.271,18.307c-0.608,0.24-1.092,0.422-1.455,0.548c-0.362,0.126-0.783,0.189-1.262,0.189
  49.  c-0.736,0-1.309-0.18-1.717-0.539s-0.611-0.814-0.611-1.367c0-0.215,0.015-0.435,0.045-0.659c0.031-0.224,0.08-0.476,0.147-0.759
  50.  l0.761-2.688c0.067-0.258,0.125-0.503,0.171-0.731c0.046-0.23,0.068-0.441,0.068-0.633c0-0.342-0.071-0.582-0.212-0.717
  51.  c-0.143-0.135-0.412-0.201-0.813-0.201c-0.196,0-0.398,0.029-0.605,0.09c-0.205,0.063-0.383,0.12-0.529,0.176l0.201-0.828
  52.  c0.498-0.203,0.975-0.377,1.43-0.521c0.455-0.146,0.885-0.218,1.29-0.218c0.731,0,1.295,0.178,1.692,0.53
  53.  c0.395,0.353,0.594,0.812,0.594,1.376c0,0.117-0.014,0.323-0.041,0.617c-0.027,0.295-0.078,0.564-0.152,0.811l-0.757,2.68
  54.  c-0.062,0.215-0.117,0.461-0.167,0.736c-0.049,0.275-0.073,0.485-0.073,0.626c0,0.356,0.079,0.599,0.239,0.728
  55.  c0.158,0.129,0.435,0.194,0.827,0.194c0.185,0,0.392-0.033,0.626-0.097c0.232-0.064,0.4-0.121,0.506-0.17L14.271,18.307z
  56.   M14.137,7.429c-0.353,0.328-0.778,0.492-1.275,0.492c-0.496,0-0.924-0.164-1.28-0.492c-0.354-0.328-0.533-0.727-0.533-1.193
  57.  c0-0.465,0.18-0.865,0.533-1.196c0.356-0.332,0.784-0.497,1.28-0.497c0.497,0,0.923,0.165,1.275,0.497
  58.  c0.353,0.331,0.53,0.731,0.53,1.196C14.667,6.703,14.49,7.101,14.137,7.429z"/>`
  59.  
  60. const svgPlayList = `
  61.  <rect x="0" y="64" width="256" height="42.667"/>
  62.  <rect x="0" y="149.333" width="256" height="42.667"/>
  63.  <rect x="0" y="234.667" width="170.667" height="42.667"/>
  64.  <polygon points="341.333,234.667 341.333,149.333 298.667,149.333 298.667,234.667 213.333,234.667 213.333,277.333 
  65.      298.667,277.333 298.667,362.667 341.333,362.667 341.333,277.333 426.667,277.333 426.667,234.667"/>
  66.      `
  67.  
  68.  
  69.  
  70.  
  71.  
  72. const svgElm = (w, h, vw, vh, p) => `<svg width="${w}" height="${h}" viewBox="0 0 ${vw} ${vh}" preserveAspectRatio="xMidYMid meet">${p}</svg>`
  73.  
  74. let settings = {
  75.     toggleSettings: {
  76.         tabs: 1,
  77.         tInfo: 1,
  78.         tComments: 1,
  79.         tVideos: 1,
  80.     },
  81.     defaultTab: "videos"
  82. };
  83.  
  84. const mtoInterval1=40;
  85. const mtoInterval2=150;
  86.  
  87. const clickInterval1=100;
  88. const clickInterval2=30;
  89.  
  90. let mtoInterval = mtoInterval1;
  91. let clickInterval=clickInterval1;
  92.  
  93. function isVideoPlaying(video) {
  94.     return video.currentTime > 0 && !video.paused && !video.ended && video.readyState > video.HAVE_CURRENT_DATA;
  95. }
  96.  
  97. function setAttr(elm, attrName, b){
  98.  
  99.     if(!elm)return;
  100.     if(b) elm.setAttribute(attrName,''); else elm.removeAttribute(attrName);
  101. }
  102.  
  103. function hideTabBtn($tabBtn){
  104.     
  105.     var isActiveBefore = $tabBtn.is('.active')
  106.  
  107.     $tabBtn.addClass("tab-btn-hidden");
  108.     if (isActiveBefore) {
  109.         setToActiveTab();
  110.     }
  111. }
  112.  
  113. function isTheater(){
  114.     
  115.     const cssElm=document.querySelector('ytd-watch-flexy');
  116.     return (cssElm && cssElm.hasAttribute('theater'))
  117. }
  118.  
  119. function isChatExpand(){
  120.     const cssElm=document.querySelector('ytd-watch-flexy');
  121.     return cssElm && cssElm.hasAttribute('userscript-chatblock') && !cssElm.hasAttribute('userscript-chat-collapsed')
  122. }
  123. function isWideScreenWithTwoColumns(){
  124.     const cssElm=document.querySelector('ytd-watch-flexy');
  125.     return (cssElm && cssElm.hasAttribute('is-two-columns_'))
  126.     
  127. }
  128.  
  129. function isAnyActiveTab(){
  130.     return $('#right-tabs .tab-btn.active').length>0
  131. }
  132.  
  133. function ytBtnCancelTheater(){
  134.     if(isTheater()){
  135.         const sizeBtn =  document.querySelector('ytd-watch-flexy #ytd-player button.ytp-size-button')
  136.         if(sizeBtn) sizeBtn.click();
  137.     }
  138. }
  139.  
  140. function ytBtnExpandChat(){
  141.     
  142.     let button = document.querySelector('ytd-live-chat-frame#chat[collapsed]>.ytd-live-chat-frame#show-hide-button')
  143.     if (button) button.querySelector('ytd-toggle-button-renderer').click();
  144. }
  145. function ytBtnCollapseChat(){
  146.     
  147.     let button = document.querySelector('ytd-live-chat-frame#chat:not([collapsed])>.ytd-live-chat-frame#show-hide-button')
  148.     if (button) button.querySelector('ytd-toggle-button-renderer').click();
  149. }
  150.  
  151. function fixDisplayForTheaterModeChanged(){
  152.     const cssElm = document.querySelector('ytd-watch-flexy')
  153.     if(!cssElm) return;
  154.     if(isTheater() && isWideScreenWithTwoColumns()){
  155.         if( isAnyActiveTab()) switchTabActivity(null)
  156.         if( isChatExpand() ) ytBtnCollapseChat()
  157.  
  158.     }else if( !isTheater() && !isChatExpand() && !isAnyActiveTab()){
  159.  
  160.         console.log('a112', lastShowTab)
  161.         if(lastShowTab=='#chatroom') ytBtnExpandChat(); else setToActiveTab();
  162.  
  163.     }else if( !isWideScreenWithTwoColumns() && !isChatExpand() && !isAnyActiveTab() ){
  164.         
  165.         setToActiveTab();
  166.  
  167.     }
  168. }
  169.  
  170. function hackImgShadow(imgShadow){
  171.     // add to #columns and add back after loaded
  172.     let img = imgShadow.querySelector('img')
  173.     if(!img)return;
  174.  
  175.     let p=imgShadow.parentNode
  176.     let z=$(imgShadow).clone()[0]; //to occupy the space
  177.     p.replaceChild(z, imgShadow)
  178.     $(imgShadow).prependTo('#columns'); // refer to css hack
  179.  
  180.     function onload(evt){
  181.         if(evt) this.removeEventListener('load',onload,false)
  182.         p.replaceChild(imgShadow, z)
  183.         p=null;
  184.         z=null;
  185.         imgShadow=null;
  186.     }
  187.  
  188.     if (img.complete) onload();
  189.     else img.addEventListener('load',onload,false)
  190. }
  191.  
  192.  
  193. const Q={}
  194.  
  195. Q.$callOnceAsync=async function(key){
  196.     if (Q[key] && Q[key]() === false) Q[key] = null
  197. }
  198.  
  199. function chatFrameElement(cssSelector){
  200.     let iframe = document.querySelector('iframe#chatframe');
  201.     if(!iframe) return null;
  202.     let cDoc = iframe.contentDocument;
  203.     if(!cDoc) return null;
  204.     if(cDoc.readyState  != 'complete') return null; //we must wait for its completion
  205.     let elm = null;
  206.     try{
  207.         elm = cDoc.querySelector(cssSelector)
  208.     }catch(e){
  209.         console.log('iframe error', e)
  210.     }
  211.     return elm;
  212. }
  213.  
  214.  
  215. function fixRelated(){
  216.     
  217.     if(!document.querySelector("#tab-videos>[placeholder-videos]>ytd-watch-next-secondary-results-renderer[data-dom-changed-by-tabview-youtube]")){
  218.  
  219.  
  220.  
  221.         let relatedVideos = document.querySelector("#related>ytd-watch-next-secondary-results-renderer");
  222.         if(relatedVideos){
  223.  
  224.             $('[placeholder-videos]').removeAttr('placeholder-videos')
  225.             $('[placeholder-for-youtube-play-next-queue]').removeAttr('placeholder-for-youtube-play-next-queue')
  226.  
  227.             let $parentNode= $(relatedVideos.parentNode).appendTo(document.querySelector("#tab-videos"))
  228.             $(relatedVideos).attr('data-dom-changed-by-tabview-youtube',scriptVersionForExternal)
  229.  
  230.             $parentNode.attr('placeholder-for-youtube-play-next-queue','').attr('placeholder-videos','')
  231.  
  232.             $('[placeholder-videos]').scroll(makeBodyScrollByEvt);
  233.  
  234.         }
  235.  
  236.         
  237.     }
  238. }
  239.  
  240. function extractTextContent(elm){
  241.     return elm.textContent.replace(/\s+/g,'').replace(/[^\da-zA-Z\u4E00-\u9FFF\u00C0-\u00FF\u00C0-\u02AF\u1E00-\u1EFF\u0590-\u05FF\u0400-\u052F\u0E00-\u0E7F\u0600-\u06FF\u0750-\u077F\u1100-\u11FF\u3130-\u318F\uAC00-\uD7AF\u3040-\u30FF\u31F0-\u31FF]/g,'')
  242. }
  243.  
  244. function mtf_fixTabsAtTheEnd(){
  245.     // if window resize, youtube coding will relocate the element
  246.     // for example, chatroom move before #right-tabs
  247.     // causing difference apperance after resize of window
  248.  
  249.  
  250.     fixRelated();
  251.  
  252.     let nonLastRightTabs = document.querySelector('#secondary #right-tabs:not(:last-child)')
  253.  
  254.     if(nonLastRightTabs){
  255.         nonLastRightTabs.parentNode.appendChild(nonLastRightTabs)
  256.     }
  257.  
  258.     let chatroom = document.querySelector('#primary ytd-live-chat-frame#chat');
  259.     if(chatroom){
  260.         let right_tabs = document.querySelector('#secondary #right-tabs:last-child')
  261.         if(right_tabs){
  262.  
  263.  
  264.             right_tabs.parentNode.insertBefore(chatroom, right_tabs)
  265.  
  266.         }
  267.         
  268.     }
  269.  
  270.  
  271.  
  272.     const autocomplete=document.querySelector('body>.autocomplete-suggestions:not([position-fixed-by-tabview-youtube]):not(:empty)')
  273.     if(autocomplete){
  274.         const searchBox = document.querySelector('[placeholder-for-youtube-play-next-queue] input#suggestions-search')
  275.  
  276.         if(searchBox){
  277.  
  278.  
  279.             autocomplete.setAttribute('position-fixed-by-tabview-youtube','');
  280.  
  281.  
  282.  
  283.             if(!searchBox.hasAttribute('is-set-click-to-toggle')){
  284.                 searchBox.setAttribute('is-set-click-to-toggle','')
  285.                 searchBox.addEventListener('click',function(){
  286.  
  287.                     setTimeout(function(){
  288.                     let elm=document.querySelector('.autocomplete-suggestions[position-fixed-by-tabview-youtube]:not(:empty)')
  289.  
  290.                     $(elm).toggle()
  291.                     //if(elm.style.display=='none') elm.style.display=''; else elm.style.display='none';
  292.                 },100);
  293.  
  294.                 })
  295.             }
  296.  
  297.  
  298.             let aaa=searchBox.nextSibling;
  299.             if(aaa && aaa.nodeName=="BFJQ"){
  300.             }else if(aaa && aaa.nodeName!="BFJQ"){
  301.  
  302.                 $(aaa=document.createElement("BFJQ")).insertAfter(searchBox);
  303.                 
  304.                 
  305.             }else{
  306.  
  307.                 $(aaa=document.createElement("BFJQ")).prependTo(searchBox.parentNode);
  308.                 
  309.  
  310.  
  311.             }
  312.             $(autocomplete).prependTo(aaa);
  313.  
  314.  
  315.             aaa.style.setProperty('--sb-margin-bottom',getComputedStyle(searchBox).marginBottom)
  316.             aaa.style.setProperty('--height',searchBox.offsetHeight + 'px')
  317.  
  318.             /*
  319.             setInterval(function(){               
  320.  
  321.                 autocomplete.style.setProperty('--ac-left',autocomplete.getBoundingClientRect().left + 'px')
  322.                 autocomplete.style.setProperty('--ac-top',autocomplete.getBoundingClientRect().top + 'px')
  323.                 autocomplete.style.setProperty('--sb-left',aaa.getBoundingClientRect().left + 'px')
  324.                 autocomplete.style.setProperty('--sb-top',aaa.getBoundingClientRect().top + 'px')
  325.  
  326.             },270)*/
  327.  
  328.         }
  329.  
  330.     }
  331.  
  332.  
  333.     let zCache=document.querySelector('[placeholder-for-youtube-play-next-queue] #items ytd-compact-video-renderer:last-of-type')
  334.     if(cachedLastVideo && zCache && cachedLastVideo!==zCache){
  335.  
  336.   //      let cachedLastVideoStr = cachedLastVideo.__userscript_prev_textcontent__;
  337.    //     cachedLastVideo=zCache
  338. //        cachedLastVideo.
  339.  /*       $0.textContent.replace(/\s+/g,'').replace(/[^\da-zA-Z\u4E00-\u9FFF]/g,'')*/
  340.  
  341.  
  342.  const searchBox = document.querySelector('[placeholder-for-youtube-play-next-queue] input#suggestions-search')
  343.  
  344.         if(!cachedLastVideo.parentNode/* || cachedLastVideoStr !== cachedLastVideo.*/){
  345.             //removed
  346.             fromSearch=true;
  347.  
  348.             requestAnimationFrame(function(){
  349.  
  350.                 $('[placeholder-for-youtube-play-next-queue]')[0].scrollTop=0;
  351.                 const searchBox=document.querySelector('[placeholder-for-youtube-play-next-queue] input#suggestions-search')
  352.                 if(searchBox) searchBox.blur();
  353.  
  354.             });
  355.         }else if(searchBox && !zCache.__clone_last_results__){
  356.  
  357.             let p=zCache.parentNode;
  358.             //update from youtube loading
  359.             setTimeout(function(){
  360.  
  361.  
  362.                 if(p&& p.parentNode) zCache.__clone_last_results__=$(p).clone();
  363.  
  364.                 //$()
  365.                 //$('ytd-watch-next-secondary-results-renderer')
  366.  
  367.             },800)
  368.  
  369.         }
  370.         cachedLastVideo=zCache
  371.  
  372.  
  373.         setTimeout(function(){
  374.             const searchBox = document.querySelector('[placeholder-for-youtube-play-next-queue] input#suggestions-search')
  375.             let zCache=document.querySelector('[placeholder-for-youtube-play-next-queue] ytd-watch-next-secondary-results-renderer #items>ytd-compact-video-renderer:last-of-type')
  376.  
  377.             let items = document.querySelector('[placeholder-for-youtube-play-next-queue] ytd-watch-next-secondary-results-renderer #items');
  378.             
  379.             if(searchBox && $(searchBox).is(":visible") && (searchBox.value||"").length===0  && items.__clone_last_results__ && fromSearch ){
  380.  
  381.  
  382.                 if(items.__clone_last_results__){
  383.  
  384.  
  385.                     for(const s of items.querySelectorAll('ytd-compact-video-renderer')){
  386.                         try{
  387.                         items.removeChild(s);
  388.                         }catch(e){}
  389.                     }
  390. /*
  391.                     let texts=[];
  392.  
  393.                     for(const s of items.querySelectorAll('[placeholder-for-youtube-play-next-queue] ytd-item-section-renderer ytd-compact-video-renderer')){
  394.                         texts.push(extractTextContent(s))
  395.                     }*/
  396.  
  397.                     for(const s of items.__clone_last_results__.querySelectorAll('ytd-compact-video-renderer')){
  398.    /*                     const text = extractTextContent(s)
  399.                         if(texts.indexOf(text)>0)continue;
  400.     */                    $(items).append(s)
  401.                     }
  402.  
  403.                     fromSearch=false;
  404.  
  405.                 }
  406.  
  407.  
  408.             }
  409.         },300)
  410.  
  411.     }else if(!cachedLastVideo && zCache && cachedLastVideo!==zCache){
  412.         
  413.         cachedLastVideo=zCache
  414.         
  415.  
  416.     }
  417.  
  418.  
  419. }
  420.  
  421. function mtf_ChatExist(){
  422.  
  423.     // no mutation triggering if the changes are inside the iframe 
  424.  
  425.     // 1) Detection of #continuations inside iframe
  426.     // iframe ownerDocument is accessible due to same origin
  427.     // if the chatroom is collasped, no determination of live chat or replay (as no #continuations and somehow a blank iframe doc)
  428.  
  429.     // 2) Detection of meta tag
  430.     // This is fastest but not reliable. It is somehow a bug that the navigation might not update the meta tag content
  431.     
  432.     // 3) Detection of HTMLElement inside video player for live video
  433.     
  434.     // (1)+(3) = solution
  435.  
  436.     
  437.     const elmChat = document.querySelector('ytd-live-chat-frame#chat')
  438.     let elmCont = null;
  439.     if(elmChat){
  440.         elmCont=chatFrameElement('yt-live-chat-renderer #continuations')
  441.     }
  442.     
  443.     const chatBlockR = (elmChat?1:0)+(elmCont?2:0)
  444.     if(Q.mtf_chatBlockQ!==chatBlockR){
  445.  
  446.         //console.log(897, Q.mtf_chatBlockQ, chatBlockR)
  447.         Q.mtf_chatBlockQ=chatBlockR
  448.  
  449.         
  450.         const cssElm = document.querySelector('ytd-watch-flexy')
  451.         if(elmChat){
  452.  
  453.             let s=0;
  454.             if(elmCont){
  455.                 //not found if it is collasped.
  456.                 s |= elmCont.querySelector('yt-timed-continuation')?1:0;
  457.                 s |= elmCont.querySelector('yt-live-chat-replay-continuation, yt-player-seek-continuation')?2:0;
  458.                 //s |= elmCont.querySelector('yt-live-chat-restricted-participation-renderer')?4:0;
  459.                 if(s==1) {
  460.                     cssElm.setAttribute('userscript-chatblock', 'chat-live')
  461.                     requestingComments=null;
  462.                 }
  463.                 if(s==2) cssElm.setAttribute('userscript-chatblock', 'chat-playback')
  464.                 //if(s==5) cssElm.setAttribute('userscript-chatblock', 'chat-live-paid')
  465.  
  466.                 if(s==1) $("span#tab3-txt-loader").text('');
  467.  
  468.             }
  469.             //keep unknown as original
  470.             if( !cssElm.hasAttribute) cssElm.setAttribute('userscript-chatblock', '')
  471.            
  472.  
  473.         }else{
  474.             cssElm.removeAttribute('userscript-chatblock')
  475.             cssElm.removeAttribute('userscript-chat-collapsed')
  476.  
  477.         }
  478.         
  479.  
  480.     }
  481. }
  482.  
  483.  
  484.  
  485.  
  486. let lastScrollAt = 0;
  487.  
  488. function makeBodyScrollByEvt(){
  489.     // inside marco task (event)
  490.  
  491.     Promise.resolve().then(()=>window.dispatchEvent(new Event("scroll")))
  492.  
  493.  
  494. }
  495.  
  496. function makeBodyScroll() {
  497.  
  498.     // avoid over triggering scroll event
  499.     if (+new Date - lastScrollAt < 30) return;
  500.     lastScrollAt = +new Date;
  501.  
  502.     //required for youtube content display
  503.  
  504.     requestAnimationFrame(()=>{
  505.  
  506.         window.dispatchEvent(new Event("scroll"));
  507.  
  508.     })
  509.     
  510.  
  511.  
  512. }
  513.  
  514. let requestingComments = null
  515. function scrollForComments_TF(){
  516.     let comments = requestingComments;
  517.     if ( comments && comments.hasAttribute('hidden')) makeBodyScroll();
  518. }
  519. function scrollForComments() {
  520.     setTimeout(scrollForComments_TF, 80);
  521.     setTimeout(scrollForComments_TF, 240);
  522.     setTimeout(scrollForComments_TF, 870);
  523. }
  524.  
  525.  
  526.  
  527. let mtoNav = null;
  528.  
  529.  
  530. const mtoVs={}
  531.  
  532.  
  533. function initObserver(){
  534.  
  535.  
  536.  
  537.  
  538.     // continuous check for element relocation
  539.     function mtf_append_comments() {
  540.         let comments = document.querySelector('#primary ytd-watch-metadata ~ #info ~ ytd-comments#comments');
  541.         if (comments) $(comments).appendTo('#tab-comments').attr('data-dom-changed-by-tabview-youtube',scriptVersionForExternal)
  542.     }
  543.  
  544.     // continuous check for element relocation
  545.     function mtf_liveChatBtnF() {
  546.         let button = document.querySelector('ytd-live-chat-frame#chat>.ytd-live-chat-frame#show-hide-button:nth-child(n+2)');
  547.         if (button) button.parentNode.insertBefore(button, button.parentNode.firstChild)
  548.     }
  549.  
  550.  
  551.     
  552.     // continuous check for element relocation
  553.     // fired at begining & window resize, etc
  554.     function mtf_append_playlist(){
  555.         let ple1 = document.querySelector("*:not(#ytd-userscript-playlist)>ytd-playlist-panel-renderer#playlist");
  556.         if(ple1){
  557.             appendWithWrapper(
  558.                 ple1,
  559.                 'ytd-userscript-playlist',  
  560.                 document.querySelector("#tab-list")
  561.             );
  562.             $(ple1).attr('data-dom-changed-by-tabview-youtube',scriptVersionForExternal)
  563.  
  564.         }
  565.     }
  566.  
  567.  
  568.     // content fix - info & playlist
  569.     // fired at begining, and keep for in case any change
  570.     function mtf_fix_details() {
  571.  
  572.         const content = document.querySelector('#meta-contents ytd-expander>#content, #tab-info ytd-expander>#content')
  573.         if (content) {
  574.             const expander = content.parentNode;
  575.  
  576.             if (expander.hasAttribute('collapsed')) setAttr(expander,'collapsed',false);
  577.  
  578.             let btn1 = expander.querySelector('tp-yt-paper-button#less:not([hidden])');
  579.             let btn2 = expander.querySelector('tp-yt-paper-button#more:not([hidden])');
  580.  
  581.             if (btn1) setAttr(btn1,'hidden',false);
  582.             if (btn2) setAttr(btn2,'hidden',false);
  583.  
  584.         }
  585.  
  586.         // just in case the playlist is collapsed
  587.         const playlist = document.querySelector('#tab-list ytd-playlist-panel-renderer#playlist')
  588.         if(playlist){
  589.             if(playlist.hasAttribute('collapsed')) setAttr(playlist,'collapsed',false);
  590.             if(playlist.hasAttribute('collapsible')) setAttr(playlist,'collapsible',false);
  591.         }        
  592.  
  593.  
  594.     }
  595.  
  596.  
  597.  
  598.     let mtoNav_requestNo=0;
  599.  
  600.     let mtoNav_delayedF = () => {
  601.     
  602.         let {addP, removeP} = Q;
  603.     
  604.         Q.addP = 0;
  605.         Q.removeP = 0;
  606.  
  607.         
  608.  
  609.         let promisesForAddition=!scriptEnable?[]:addP > 0?[
  610.             Q.$callOnceAsync('mtf_advancedComments'),
  611.             Q.$callOnceAsync('mtf_infoSectionHeight'),
  612.             Q.$callOnceAsync('mtf_checkDescriptionLoaded'),
  613.             Q.$callOnceAsync('mtf_checkPlayList'),
  614.             Q.$callOnceAsync('mtf_fetchCommentsAvailable'),
  615.             Q.$callOnceAsync('mtf_initalAttr_comments'),
  616.             Q.$callOnceAsync('mtf_initalAttr_playlist'),
  617.             Q.$callOnceAsync('mtf_checkStatus_chatroom'),
  618.             Q.$callOnceAsync('mtf_checkFlexy'),
  619.             Q.$callOnceAsync('mtf_forceCheckLiveVideo'),
  620.  
  621.             (async () => {
  622.                 mtf_append_comments();
  623.             })(),
  624.     
  625.             (async () => {
  626.                 mtf_liveChatBtnF();
  627.             })(),
  628.  
  629.             (async ()=>{
  630.                 mtf_fixTabsAtTheEnd();
  631.             })(),
  632.         
  633.             (async () => {
  634.                 mtf_append_playlist();
  635.             })()
  636.         ]:[];
  637.         
  638.  
  639.  
  640.         let promisesForEveryMutation=!scriptEnable?[]:[
  641.             (async () => {
  642.                 mtf_fix_details();
  643.             })(),
  644.             (async () => {
  645.                 mtf_ChatExist();
  646.             })()
  647.         ];
  648.  
  649.  
  650.         Promise.all([...promisesForAddition,...promisesForEveryMutation]).then(()=>{
  651.             mtoNav_requestNo--;
  652.             //console.log('motnav reduced to', mtoNav_requestNo)
  653.             if(mtoNav_requestNo>0){
  654.                 mtoNav_requestNo=1;
  655.                 setTimeout(mtoNav_delayedF,mtoInterval);
  656.             }
  657.         })
  658.     
  659.     
  660.     }
  661.  
  662.     Q.addP=0;
  663.     Q.removeP=0; 
  664.     let hReqNo=0;
  665.     const mtoNavF=(mutations, observer) => {
  666.  
  667.         let ch = false;
  668.         for (const mutation of mutations) {
  669.             for (const addedNode of mutation.addedNodes)
  670.                 if (addedNode.nodeType === 1) {
  671.                     Q.addP++
  672.                     ch = true;
  673.                 }
  674.             for (const removedNode of mutation.removedNodes)
  675.                 if (removedNode.nodeType === 1) {
  676.                     Q.removeP++;
  677.                     ch = true;
  678.                 }
  679.         }
  680.         if (!ch) return;
  681.  
  682.         mtoNav_requestNo++;
  683.         hReqNo++;
  684.         if(hReqNo==36) {
  685.              mtoInterval=mtoInterval2;
  686.              clickInterval=clickInterval2;
  687.         }
  688.         //console.log('motnav added to', mtoNav_requestNo)
  689.  
  690.         if(mtoNav_requestNo==1) setTimeout(mtoNav_delayedF,mtoInterval);
  691.  
  692.     }
  693.     mtoNav = new MutationObserver(mtoNavF);
  694.     mtoNav.observe(document.querySelector('ytd-watch-flexy'), {
  695.         subtree: true,
  696.         childList: true
  697.     })
  698.  
  699.     1;1&&(async()=>{
  700.         Q.addP=1; //fake the function
  701.         mtoNav_requestNo++;
  702.         if(mtoNav_requestNo==1) mtoNav_delayedF();
  703.  
  704.     })();
  705. }
  706.  
  707. let displayedPlaylist=null
  708. let scrollingVideosList=null
  709.  
  710. let scriptEnable =false;
  711. let lastShowTab = null;
  712.  
  713.  
  714. let cachedLastVideo=null;
  715. let fromSearch=false;
  716. function resetBeforeNav() {
  717.     fromSearch=true;
  718.     cachedLastVideo=null;
  719.     lastShowTab=null;
  720.     displayedPlaylist=null
  721.     scrollingVideosList=null
  722.     scriptEnable =false;
  723.  
  724.  
  725.     clearMutationObserver(mtoVs,'mtoVisibility_Playlist')
  726.     clearMutationObserver(mtoVs,'mtoVisibility_Comments')
  727.     clearMutationObserver(mtoVs,'mtoVisibility_Chatroom')
  728.     clearMutationObserver(mtoVs,'mtoFlexyAttr')
  729.  
  730.     if (mtoNav) {
  731.         mtoNav.takeRecords();
  732.         mtoNav.disconnect();
  733.         mtoNav = null;
  734.  
  735.         Q.mtf_advancedComments=null;
  736.         Q.mtf_checkDescriptionLoaded = null;
  737.         Q.mtf_checkPlayList = null;
  738.         Q.mtf_fetchCommentsAvailable = null;
  739.         Q.mtf_initalAttr_comments = null;
  740.         Q.mtf_initalAttr_playlist = null;
  741.         Q.mtf_checkStatus_chatroom = null;
  742.         Q.mtf_forceCheckLiveVideo=null;
  743.         Q.mtf_chatBlockQ = null;
  744.     }
  745.  
  746.     mtoInterval = mtoInterval1;
  747.     clickInterval = clickInterval1;
  748.  
  749. }
  750.  
  751. function resetAtNav() {
  752.  
  753.     scriptEnable =true;
  754.  
  755.     $("ytd-watch-flexy").removeAttr("userscript-chatblock").removeAttr("userscript-chat-collapsed");
  756.     $('#tab-comments').attr('lazy-loading', '');
  757.     $('span#tab3-txt-loader').text('');
  758.  
  759.     //removed any cache of #comments header (i.e. count message)
  760.     var prevCommentsHeader = document.querySelector('ytd-comments#comments ytd-comments-header-renderer');
  761.     if (prevCommentsHeader) prevCommentsHeader.parentNode.removeChild(prevCommentsHeader);
  762.  
  763.     var prevCommentsMsg= document.querySelector('ytd-item-section-renderer#sections #header ~ #contents>ytd-message-renderer:only-child');
  764.     if (prevCommentsMsg) prevCommentsMsg.parentNode.removeChild(prevCommentsMsg);
  765.  
  766.     //force to [hidden]
  767.     var prevComemnts = document.querySelector('ytd-comments#comments'); 
  768.     if (prevComemnts) {
  769.         setAttr(prevComemnts, 'hidden', true);
  770.         requestingComments = prevComemnts;
  771.         //scrollForComments();
  772.     }
  773.  
  774.     
  775.     //playlist bug
  776.     /*
  777.     var prevPlaylist = document.querySelector('ytd-watch-flexy #columns ytd-playlist-panel-renderer#playlist')
  778.     var secondInner = document.querySelector('ytd-watch-flexy #secondary>#secondary-inner');
  779.     if (prevPlaylist && secondInner){
  780.  
  781.  
  782.         prevPlaylist.removeAttribute('hidden')
  783.         secondInner.appendChild(prevPlaylist)
  784.  
  785.     }
  786.  
  787.     var prevRelated = document.querySelector('ytd-watch-flexy #columns #related')
  788.     if (prevRelated && secondInner){
  789.  
  790.         secondInner.appendChild(prevRelated)
  791.     }*/
  792.     
  793.  
  794.  
  795. }
  796.  
  797. function getTabsHTML(){
  798.  
  799.  
  800.     let ts = settings.toggleSettings;
  801.  
  802.     if (!ts.tabs) return;
  803.  
  804.     const sTabBtnVideos = `${svgElm(16,16,298,298,svgVideos)}<span>Videos</span>`
  805.     const sTabBtnInfo = `${svgElm(16,16,23.625,23.625,svgInfo)}<span>Info</span>`
  806.     const sTabBtnPlayList = `${svgElm(16,16,426.667,426.667,svgPlayList)}<span>Playlist</span>`
  807.  
  808.     const str1 = `
  809.      <paper-ripple class="style-scope yt-icon-button">
  810.          <div id="background" class="style-scope paper-ripple" style="opacity:0;"></div>
  811.          <div id="waves" class="style-scope paper-ripple"></div>
  812.      </paper-ripple>
  813.      `;
  814.  
  815.     const str_tabs = [
  816.         ts.tInfo ? `<a id="tab-btn1" data-name="info" userscript-tab-content="#tab-info" class="tab-btn">${sTabBtnInfo}${str1}</a>` : '',
  817.         `<a id="tab-btn2" userscript-tab-content="#tab-live" class="tab-btn tab-btn-hidden">Chat${str1}</a>`,
  818.         ts.tComments ? `<a id="tab-btn3" userscript-tab-content="#tab-comments" data-name="comments" class="tab-btn">${svgElm(16,16,60,60,svgComments)}<span id="tab3-txt-loader"></span>${str1}</a>` : '',
  819.         ts.tVideos ? `<a id="tab-btn4" userscript-tab-content="#tab-videos" data-name="videos" class="active tab-btn">${sTabBtnVideos}${str1}</a>` : '',
  820.         `<a id="tab-btn5" userscript-tab-content="#tab-list" class="tab-btn">${sTabBtnPlayList}${str1}</a>`
  821.     ].join('')
  822.  
  823.     var addHTML = `
  824.      <div id="right-tabs">
  825.          <header>
  826.              <div id="material-tabs">
  827.                  ${str_tabs}
  828.              </div>
  829.          </header>
  830.          <div class="tab-content">
  831.              <div id="tab-info" class="tab-content-cld" userscript-scrollbar-render></div>
  832.              <div id="tab-live" class="tab-content-cld tab-content-hidden" userscript-scrollbar-render></div>
  833.              <div id="tab-comments" class="tab-content-cld" userscript-scrollbar-render></div>
  834.              <div id="tab-videos" class="tab-content-cld" userscript-scrollbar-render></div>
  835.              <div id="tab-list" class="tab-content-cld" userscript-scrollbar-render></div>
  836.          </div>
  837.      </div>
  838.      `;
  839.  
  840.      return addHTML
  841.  
  842. }
  843.  
  844. function onNavigationEnd() {
  845.  
  846.     resetBeforeNav();
  847.     if(!/https?\:\/\/(\w+\.)*youtube\.com\/watch\?(\w+\=[^\/\?\&]+\&)*v=[\w\-\_]+/.test(window.location.href))return;
  848.     resetAtNav();
  849.  
  850.  
  851.     let promise = Promise.resolve();
  852.  
  853.     if (!document.querySelector("#right-tabs")) {
  854.         let targetElm = document.querySelector("ytd-watch-flexy #secondary>#secondary-inner")||document.querySelector("ytd-watch-flexy #secondary")||document.querySelector("ytd-watch-flexy #columns");
  855.         if(!targetElm) throw 'Userscript: Two Column flexy layout not found'; // not flexy layout
  856.         promise=promise.then(()=>{
  857.             $(getTabsHTML()).appendTo(targetElm).attr('data-dom-created-by-tabview-youtube',scriptVersionForExternal);
  858.             targetElm=null;
  859.         })
  860.     }
  861.  
  862.     promise.then(runAfterTabAppended).then(initObserver)
  863.  
  864. }
  865.  
  866. function setToActiveTab() {
  867.     if(isTheater() && isWideScreenWithTwoColumns())return;
  868.     const jElm = document.querySelector(`a[userscript-tab-content="${switchTabActivity_lastTab}"]:not(.tab-btn-hidden)`) ||
  869.         document.querySelector(`a[userscript-tab-content="#tab-${settings.defaultTab}"]:not(.tab-btn-hidden)`) ||
  870.         document.querySelector("a[userscript-tab-content]:not(.tab-btn-hidden)") ||
  871.         null;
  872.     switchTabActivity(jElm);
  873. }
  874.  
  875. function insertBefore(elm, p) {
  876.     if (elm && p && p.parentNode)
  877.         p.parentNode.insertBefore(elm, p);
  878. }
  879.  
  880. function appendWithWrapper(elm, wrapperId, toParent){
  881.     if(!toParent||!elm)return;
  882.     let $wrapper = $(`#${wrapperId}`);
  883.     if(!$wrapper[0]) $wrapper=$(`<div id="${wrapperId}"></div>`)
  884.     $wrapper.append(elm).appendTo(toParent);
  885. }
  886.  
  887. function runAfterTabAppended() {
  888.  
  889.     // just switch to the default tab
  890.     setToActiveTab();
  891.  
  892.     // append the next videos 
  893.     // it exists as "related" is already here
  894.  
  895.     fixRelated();
  896.  
  897.  
  898.  
  899.     prepareTabBtn();
  900.  
  901.     
  902.     // append the detailed meta contents to the tab-info
  903.     Q.mtf_checkDescriptionLoaded = () => {
  904.         const expander = document.querySelector("#meta-contents ytd-expander");
  905.         if (!expander) return true;
  906.         $(expander).appendTo("#tab-info").attr('data-dom-changed-by-tabview-youtube',scriptVersionForExternal)
  907.  
  908.         const avatar = document.querySelector('ytd-watch-flexy #meta-contents yt-img-shadow#avatar');
  909.         if(avatar) hackImgShadow(avatar)
  910.         return false;
  911.     }
  912.     Q.$callOnceAsync('mtf_checkDescriptionLoaded')
  913.  
  914.     // force window scroll when #continuations is first detected and #comments still [hidden]
  915.     Q.mtf_advancedComments = () => {
  916.         const continuations = document.querySelector("ytd-comments#comments #continuations");
  917.         if (!continuations) return true;
  918.         requestingComments = document.querySelector('ytd-comments#comments');
  919.         scrollForComments();
  920.         return false;
  921.     }
  922.     Q.$callOnceAsync('mtf_advancedComments')
  923.  
  924. /*
  925.     Q.mtf_infoSectionHeight=()=>{
  926.         const infoSection = document.querySelector("#primary #player ~ #info>#info-contents");
  927.         if (!infoSection) return true;
  928.         if(mtoVs.rsoInfoSection) {
  929.             mtoVs.rsoInfoSection.disconnect();
  930.             mtoVs.rsoInfoSection=null;
  931.         }
  932.         mtoVs.rsoInfoSection=new ResizeObserver(()=>{
  933.             const cssElm = document.querySelector('ytd-watch-flexy')
  934.             if(!cssElm)return;
  935.             cssElm.style.setProperty('--userscript-info-section-height', infoSection.offsetHeight);
  936.         });
  937.         return false;
  938.     }
  939.     Q.$callOnceAsync('mtf_infoSectionHeight')*/
  940.  
  941.  
  942.  
  943.     // make window scroll event from playlist scrolling
  944.     // i guess it shall be not neccessary, just in case
  945.     /*Q.mtf_checkPlayList = () => {
  946.         const items= document.querySelector('ytd-playlist-panel-renderer>#container>#items');
  947.         if(!items) return true;
  948.         $(items).scroll(makeBodyScrollByEvt);
  949.         return false;
  950.     }
  951.     Q.$callOnceAsync('mtf_checkPlayList')*/
  952.  
  953.  
  954.     // use video player's element to detect the live-chat situation (no commenting section)
  955.     // this would be very useful if the live chat is collapsed, i.e. iframe has no indication on the where it is live or replay
  956.     
  957.     Q.mtf_forceCheckLiveVideo_tf =()=>{
  958.         const cssElm = document.querySelector('ytd-watch-flexy')
  959.         if(!cssElm) return;
  960.         if($('#ytd-player .ytp-time-display').is('.ytp-live')) {
  961.             cssElm.setAttribute('userscript-chatblock', 'chat-live')
  962.             requestingComments=null;
  963.         }
  964.     }
  965.     Q.mtf_forceCheckLiveVideo = () => {
  966.         const playerLabel = document.querySelector('#ytd-player .ytp-time-display') && document.querySelector('ytd-live-chat-frame#chat')
  967.         if (!playerLabel) return true;
  968.         setTimeout(Q.mtf_forceCheckLiveVideo_tf,170)
  969.         return false;
  970.     }
  971.     Q.$callOnceAsync('mtf_forceCheckLiveVideo')
  972.  
  973.  
  974.  
  975.     createAttributeObservants();
  976.     checkChatStatus();
  977.  
  978.  
  979.     $("#right-tabs [userscript-scrollbar-render]").scroll(makeBodyScrollByEvt);
  980.  
  981. }
  982.  
  983.  
  984. async function asyncFetchCommentsAvailable() {
  985.  
  986.     let span = document.querySelector("span#tab3-txt-loader")
  987.     if (!span) return;
  988.  
  989.     makeBodyScroll();
  990.  
  991.     let fetchedOnce = false
  992.     Q.mtf_fetchCommentsAvailable = () => {
  993.  
  994.         if(!scriptEnable)return;
  995.  
  996.         let messageElm, messageStr;
  997.         const commentRenderer = document.querySelector("ytd-comments#comments #count.ytd-comments-header-renderer");
  998.         if (commentRenderer) {
  999.             fetchedOnce=true;
  1000.             let r = '0';
  1001.             let txt = commentRenderer.textContent
  1002.             if (typeof txt == 'string') {
  1003.                 let m = txt.match(/[\d\,\s]+/)
  1004.                 if (m) r = m[0].trim()
  1005.             }
  1006.             span.textContent = r;
  1007.             $('#tab-comments[lazy-loading]').removeAttr('lazy-loading')
  1008.             mtoInterval=mtoInterval2;
  1009.             clickInterval=clickInterval2;
  1010.         }else if((messageElm = document.querySelector('ytd-item-section-renderer#sections #header ~ #contents>ytd-message-renderer:only-child'))&&(messageStr=(messageElm.textContent||'').trim())){ //ytd-message-renderer
  1011.             // it is possible to get the message before the header generation.
  1012.             setTimeout(function(){
  1013.                 if(fetchedOnce)return;
  1014.                 const mainMsg= messageElm.querySelector('#message, #submessage')
  1015.                 if(mainMsg && mainMsg.textContent){
  1016.                     for(const msg of mainMsg.querySelectorAll('*:not(:empty)')){
  1017.                         if(msg.childElementCount===0 && msg.textContent) {
  1018.                             messageStr=msg.textContent.trim()
  1019.                             break
  1020.                         }
  1021.                     } 
  1022.                 }
  1023.                 span.textContent = messageStr;
  1024.                 $('#tab-comments[lazy-loading]').removeAttr('lazy-loading')
  1025.             },240);
  1026.         }
  1027.         return true;
  1028.     
  1029.     }
  1030.     Q.$callOnceAsync('mtf_fetchCommentsAvailable')
  1031.  
  1032.  
  1033. }
  1034.  
  1035.  
  1036.  
  1037.  
  1038. function createAttributeObservants() {
  1039.  
  1040.  
  1041.     // Attr Mutation Observer - #playlist - hidden
  1042.     clearMutationObserver(mtoVs,'mtoVisibility_Playlist')
  1043.     // Attr Mutation Observer callback - #playlist - hidden
  1044.     let mtf_attrPlaylist=(mutations, observer)=>{
  1045.         var playlist=document.querySelector('ytd-playlist-panel-renderer#playlist')
  1046.         const $tabBtn = $('[userscript-tab-content="#tab-list"]');
  1047.         //console.log(3712,$tabBtn)
  1048.         //console.log('attr playlist changed')
  1049.         if( $tabBtn.is('.tab-btn-hidden') && !playlist.hasAttribute('hidden') ){
  1050.             //console.log(3713)
  1051.             //console.log('attr playlist changed - no hide')
  1052.             $tabBtn.removeClass("tab-btn-hidden");
  1053.         }else if( !$tabBtn.is('.tab-btn-hidden') && playlist.hasAttribute('hidden') ){
  1054.             //console.log(3714)
  1055.             //console.log('attr playlist changed - add hide')
  1056.             hideTabBtn($tabBtn);
  1057.         }
  1058.     }
  1059.  
  1060.     // pending for #playlist and set Attribute Observer
  1061.     Q.mtf_initalAttr_playlist=()=>{
  1062.         var playlist=document.querySelector('ytd-playlist-panel-renderer#playlist')
  1063.         if(!playlist) return true;
  1064.         initMutationObserver(mtoVs,'mtoVisibility_Playlist', mtf_attrPlaylist)
  1065.         mtoVs.mtoVisibility_Playlist.observe(playlist, {          
  1066.             attributes: true,
  1067.             attributeFilter: ['hidden'],
  1068.             attributeOldValue: true
  1069.         })
  1070.         //console.log(3711)
  1071.         mtf_attrPlaylist()
  1072.         return false;
  1073.     }
  1074.     //console.log(3710)
  1075.     Q.$callOnceAsync('mtf_initalAttr_playlist')
  1076.  
  1077.  
  1078.  
  1079.  
  1080.  
  1081.     // Attr Mutation Observer - ytd-comments#comments - hidden
  1082.     
  1083.     clearMutationObserver(mtoVs,'mtoVisibility_Comments')
  1084.     // Attr Mutation Observer callback - ytd-comments#comments - hidden
  1085.     let mtf_attrComments=(mutations, observer)=>{
  1086.         var comments=document.querySelector('ytd-comments#comments')
  1087.         const $tabBtn = $('[userscript-tab-content="#tab-comments"]');
  1088.         if(!comments || !$tabBtn[0])return;
  1089.         //console.log('attr comments changed')
  1090.         if( $tabBtn.is('.tab-btn-hidden') && !comments.hasAttribute('hidden') ){
  1091.             //console.log('attr comments changed - no hide')
  1092.             $tabBtn.removeClass("tab-btn-hidden");
  1093.             asyncFetchCommentsAvailable();
  1094.         }else if( !$tabBtn.is('.tab-btn-hidden') && comments.hasAttribute('hidden') ){
  1095.             //console.log('attr comments changed - add hide')
  1096.             if(!document.querySelector('[userscript-chatblock="chat-live"]')){
  1097.                 requestingComments=comments
  1098.                 $('#tab-comments').attr('lazy-loading','')
  1099.             } 
  1100.             $('span#tab3-txt-loader').text('');
  1101.             hideTabBtn($tabBtn);
  1102.         }        
  1103.     }
  1104.  
  1105.     // pending for #comments and set Attribute Observer
  1106.     Q.mtf_initalAttr_comments=()=>{
  1107.         var comments=document.querySelector('ytd-comments#comments')
  1108.         if(!comments) return true;
  1109.         initMutationObserver(mtoVs,'mtoVisibility_Comments',mtf_attrComments)
  1110.         mtoVs.mtoVisibility_Comments.observe(comments, {          
  1111.             attributes: true,
  1112.             attributeFilter: ['hidden'],
  1113.             attributeOldValue: true
  1114.         })
  1115.         mtf_attrComments()
  1116.         requestingComments = document.querySelector('ytd-comments#comments');
  1117.         scrollForComments()
  1118.         return false;
  1119.     }
  1120.     Q.$callOnceAsync('mtf_initalAttr_comments')
  1121.  
  1122. }
  1123.  
  1124.  
  1125. function isEmptyBody(){
  1126.     //only deal with loaded document without body
  1127.     //other situation, case by case
  1128.  
  1129.     let iframe = document.querySelector('ytd-live-chat-frame iframe#chatframe');
  1130.  
  1131.     if(!iframe) return false; //iframe must be there
  1132.  
  1133.     if(iframe.readyState  != 'complete') return false; //we must wait for its completion
  1134.  
  1135.     let doc = null;
  1136.     try{
  1137.  
  1138.         doc=iframe.contentDocument
  1139.  
  1140.     }catch(e){}
  1141.  
  1142.     if(!doc) return false; //might be not loaded yet
  1143.  
  1144.     if(doc.body && doc.body.childElementCount===0){
  1145.         //empty body
  1146.  
  1147.         return true;
  1148.     }
  1149.  
  1150.  
  1151. }
  1152.  
  1153. function checkChatStatus(){
  1154.     
  1155.     
  1156.     clearMutationObserver(mtoVs,'mtoVisibility_Chatroom')
  1157.  
  1158.     let cid_chatFrameCheck=0;
  1159.  
  1160.     let mtf_attrChatroom=(mutations, observer)=>{
  1161.  
  1162.         const chatBlock = document.querySelector('ytd-live-chat-frame#chat')
  1163.         const cssElm = document.querySelector('ytd-watch-flexy')
  1164.         
  1165.         if(!cssElm.hasAttribute('userscript-chatblock')) setAttr(cssElm, 'userscript-chatblock', true);
  1166.         setAttr(cssElm,'userscript-chat-collapsed',!!chatBlock.hasAttribute('collapsed'));
  1167.  
  1168.         if(cssElm.hasAttribute('userscript-chatblock')&&!chatBlock.hasAttribute('collapsed')) lastShowTab='#chatroom'
  1169.  
  1170.         if( chatBlock && cssElm && cssElm.hasAttribute('userscript-chatblock') && !chatBlock.hasAttribute('collapsed') && !cid_chatFrameCheck){
  1171.             let dd=+new Date;
  1172.             cid_chatFrameCheck=setInterval(()=>{
  1173.                 // mutation on iframe window would not trigger the observer
  1174.                 // just check the first few seconds for this purpose.
  1175.                 let chatFrameChecking, iframe;
  1176.                 if(+new Date - dd>6750){
  1177.                     //
  1178.                 }else if( isEmptyBody() ){
  1179.  
  1180.                     // bug. youtube iframe loaded with nothing
  1181.  
  1182.                     let button = document.querySelector('ytd-live-chat-frame#chat>.ytd-live-chat-frame#show-hide-button ytd-toggle-button-renderer')
  1183.                     if (button) {
  1184.                         setTimeout(function(){
  1185.                             if(button && button.parentNode && isChatExpand()){
  1186.                                 button.click();
  1187.                                 setTimeout(function(){
  1188.                                     if(button && button.parentNode && !isChatExpand()) button.click();
  1189.                                     button=null;
  1190.                                 },80)
  1191.                             }else{
  1192.                                 button=null;
  1193.                             }
  1194.                         },20)
  1195.                     } 
  1196.  
  1197.                 
  1198.                 }else if(chatFrameChecking=!!chatFrameElement('yt-live-chat-renderer #continuations')){
  1199.                     mtf_ChatExist();
  1200.                     $(document.querySelector('ytd-live-chat-frame#chat')).attr('yt-userscript-iframe-loaded','')
  1201.                 }else{
  1202.                     return;
  1203.                 }
  1204.                 return (cid_chatFrameCheck=clearInterval(cid_chatFrameCheck));
  1205.             },270)
  1206.         }else if(chatBlock){
  1207.             chatBlock.removeAttribute('yt-userscript-iframe-loaded')
  1208.  
  1209.         }
  1210.  
  1211.  
  1212.     }
  1213.  
  1214.     Q.mtf_checkStatus_chatroom=()=>{
  1215.         var chatroom=document.querySelector('ytd-live-chat-frame#chat')
  1216.         if(!chatroom) return true;
  1217.         initMutationObserver(mtoVs,'mtoVisibility_Chatroom',mtf_attrChatroom)
  1218.         mtoVs.mtoVisibility_Chatroom.observe(chatroom, {          
  1219.             attributes: true,
  1220.             attributeFilter: ['collapsed'],
  1221.             attributeOldValue: true
  1222.         })
  1223.         mtf_attrChatroom()
  1224.         return false;
  1225.     }
  1226.     Q.$callOnceAsync('mtf_checkStatus_chatroom')
  1227.  
  1228.  
  1229.  
  1230.  
  1231.  
  1232.     clearMutationObserver(mtoVs,'mtoFlexyAttr')
  1233.  
  1234.  
  1235.     let mtf_attrFlexy=(mutations, observer)=>{
  1236.           
  1237.  
  1238.  
  1239.         const cssElm=document.querySelector('ytd-watch-flexy');
  1240.         if(!cssElm)return;
  1241.  
  1242.         let chatBlockStatusChanged = false
  1243.         let theaterStatusChanged = false;
  1244.         let twoColStatusChanged = false;
  1245.         let initalTriggering = !mutations
  1246.  
  1247.         if(!initalTriggering){
  1248.         
  1249.             for(const mutation of mutations) {
  1250.                 if (mutation.attributeName == 'theater') {
  1251.                     theaterStatusChanged=true;
  1252.                 }
  1253.                 if (mutation.attributeName == 'userscript-chat-collapsed' || 'userscript-chatblock'){
  1254.                     chatBlockStatusChanged=true
  1255.                 }
  1256.                 if (mutation.attributeName == 'is-two-columns_'){
  1257.                 
  1258.                     twoColStatusChanged=true;
  1259.                 }
  1260.             }
  1261.         }
  1262.     
  1263.  
  1264.         if(theaterStatusChanged || chatBlockStatusChanged || twoColStatusChanged || initalTriggering  ){
  1265.  
  1266.  
  1267.             if(twoColStatusChanged || initalTriggering){
  1268.  
  1269.                 fixDisplayForTheaterModeChanged();
  1270.  
  1271.             }else if(theaterStatusChanged){
  1272.  
  1273.                 isChatExpandBeforeTheaterChange = isChatExpand()
  1274.                 requestAnimationFrame(fixDisplayForTheaterModeChanged)
  1275.             }else if(chatBlockStatusChanged){
  1276.                 //chatroom is shown or hidden
  1277.  
  1278.                 let isOpenChatFrame =  !cssElm.hasAttribute('userscript-chat-collapsed') && cssElm.hasAttribute('userscript-chatblock') 
  1279.                 
  1280.  
  1281.                 new Promise(requestAnimationFrame).then(() => {
  1282.                     if (isOpenChatFrame && !isTheater() && isWideScreenWithTwoColumns()) {
  1283.                         switchTabActivity(null)
  1284.                     } else if(!isOpenChatFrame && !isTheater() && isWideScreenWithTwoColumns()){
  1285.                         setToActiveTab();
  1286.                     } else if(isTheater() && isWideScreenWithTwoColumns() && isOpenChatFrame && isWideScreenWithTwoColumns()){
  1287.                         ytBtnCancelTheater();
  1288.                     }
  1289.                 })
  1290.  
  1291.             }
  1292.  
  1293.             
  1294.  
  1295.         }
  1296.  
  1297.  
  1298.  
  1299.  
  1300.  
  1301.  
  1302.     }
  1303.  
  1304.  
  1305.     Q.mtf_checkFlexy=()=>{
  1306.         var flexy=document.querySelector('ytd-watch-flexy')
  1307.         if(!flexy) return true;
  1308.         initMutationObserver(mtoVs,'mtoFlexyAttr',mtf_attrFlexy)
  1309.         mtoVs.mtoFlexyAttr.observe(flexy, {          
  1310.             attributes: true,
  1311.             attributeFilter: ['userscript-chat-collapsed','userscript-chatblock','theater','is-two-columns_'],
  1312.             attributeOldValue: true
  1313.         })
  1314.         mtf_attrFlexy()
  1315.  
  1316.  
  1317.         let columns = document.querySelector('ytd-page-manager#page-manager #columns')
  1318.         if(columns){
  1319.             setAttr(columns, 'userscript-scrollbar-render', true);
  1320.         }
  1321.  
  1322.         return false;
  1323.     }
  1324.     Q.$callOnceAsync('mtf_checkFlexy')
  1325.  
  1326.  
  1327.  
  1328. }
  1329.  
  1330.  
  1331.  
  1332.  
  1333. let switchTabActivity_lastTab = null
  1334.  
  1335. function switchTabActivity(activeLink) {
  1336.  
  1337.  
  1338.     if (activeLink && $(activeLink).is('.tab-btn-hidden')) return; // not allow to switch to hide tab
  1339.  
  1340.     if(isTheater() && isWideScreenWithTwoColumns()) activeLink=null;
  1341.  
  1342.     const links = document.querySelectorAll('#material-tabs a[userscript-tab-content]');
  1343.  
  1344.  
  1345.  
  1346.     function runAtEnd(){
  1347.  
  1348.         if(activeLink) lastShowTab=activeLink.getAttribute('userscript-tab-content')
  1349.  
  1350.  
  1351.         //override the default youtube coding event prevention
  1352.  
  1353.         //let elm=$('ytd-watch-flexy:not([is-two-columns_]) #tab-list:not(.tab-content-hidden) ytd-playlist-panel-renderer')[0];
  1354.         let elm=$('ytd-watch-flexy #tab-list:not(.tab-content-hidden) ytd-playlist-panel-renderer')[0];
  1355.         displayedPlaylist=elm;
  1356.         if(!!displayedPlaylist) $('ytd-watch-flexy').attr('userscript-auto-scroll-playlist',''); else $('ytd-watch-flexy').removeAttr('userscript-auto-scroll-playlist');
  1357.         
  1358.         scrollingVideosList=$('ytd-watch-flexy #tab-videos:not(.tab-content-hidden) [placeholder-videos]')[0]
  1359.         
  1360.     }
  1361.  
  1362.     for (const link of links) {
  1363.         let content = document.querySelector(link.getAttribute('userscript-tab-content'));
  1364.         if (link && content) {
  1365.             if (link !== activeLink) {
  1366.                 $(link).removeClass("active");
  1367.                 $(content).addClass("tab-content-hidden");
  1368.             } else {
  1369.                 $(link).addClass("active");
  1370.                 $(content).removeClass("tab-content-hidden");
  1371.                 window.requestAnimationFrame(() => {
  1372.                  
  1373.                     content.focus()
  1374.  
  1375.                     runAtEnd()
  1376.                 })
  1377.             }
  1378.         }
  1379.     }
  1380.  
  1381.     if(!activeLink){
  1382.         runAtEnd();
  1383.     }
  1384.  
  1385.  
  1386. }
  1387.  
  1388. let tabsUiScript_setclick = false;
  1389.  
  1390. function prepareTabBtn() {
  1391.  
  1392.     const materialTab = document.querySelector("#material-tabs")
  1393.     if (!materialTab) return;
  1394.  
  1395.     let noActiveTab = !!document.querySelector('ytd-watch-flexy[userscript-chatblock]:not([userscript-chat-collapsed])')
  1396.  
  1397.     const activeLink = materialTab.querySelector('a[userscript-tab-content].active:not(.tab-btn-hidden)')
  1398.     if (activeLink) switchTabActivity(noActiveTab ? null : activeLink)
  1399.  
  1400.     if (!tabsUiScript_setclick) {
  1401.         tabsUiScript_setclick = true;
  1402.         $(materialTab).on("click", "a", function(evt) {
  1403.  
  1404.             if (!this.hasAttribute('userscript-tab-content')) return;
  1405.  
  1406.             switchTabActivity_lastTab = this.getAttribute('userscript-tab-content');
  1407.  
  1408.             if( isWideScreenWithTwoColumns() && !isTheater() && $(this).is(".tab-btn.active:not(.tab-btn-hidden)")){
  1409.  
  1410.                 const sizeBtn=document.querySelector('ytd-watch-flexy #ytd-player button.ytp-size-button')
  1411.                 
  1412.                 if(sizeBtn) sizeBtn.click();
  1413.  
  1414.             }else if($(this).is(".tab-btn.active:not(.tab-btn-hidden)")){
  1415.             
  1416.  
  1417.                 switchTabActivity(null);
  1418.  
  1419.  
  1420. /*
  1421.                 setTimeout(()=>{
  1422.                         window.scrollTo(0, 0);
  1423.                        
  1424.                 },60)*/
  1425.  
  1426.  
  1427.  
  1428.             }else{
  1429.  
  1430.                 new Promise(requestAnimationFrame).then(() => {
  1431.                     if(isChatExpand() && isWideScreenWithTwoColumns()) ytBtnCollapseChat();
  1432.                     else if(isWideScreenWithTwoColumns() && isTheater() ) ytBtnCancelTheater();
  1433.                 }).then(() => {
  1434.                     setTimeout(()=>{
  1435.                         switchTabActivity(this)
  1436.                         
  1437.                         //setTimeout(makeBodyScroll,20);
  1438.  
  1439.  
  1440.                         setTimeout(()=>{
  1441.                             let rightTabs=document.querySelector('#right-tabs');
  1442.                             if(!isWideScreenWithTwoColumns() && rightTabs && rightTabs.offsetTop>0 && $(this).is('.active')){
  1443.  
  1444.                                 window.scrollTo(0, rightTabs.offsetTop);
  1445.                                
  1446.                             }
  1447.                         },60)
  1448.  
  1449.                     }, clickInterval);
  1450.                 })
  1451.  
  1452.             }
  1453.  
  1454.             
  1455.  
  1456.             evt.preventDefault();
  1457.         });
  1458.  
  1459.     }
  1460.  
  1461. }
  1462.  
  1463.  
  1464. // ---------------------------------------------------------------------------------------------
  1465. window.addEventListener("yt-navigate-finish", onNavigationEnd)
  1466.  
  1467. const singleColumnScrolling = (function() {
  1468.     var lastD = 0,
  1469.         lastF = 0;
  1470.  
  1471.     return function() {
  1472.         let pageY = pageYOffset;
  1473.         if (pageY < 10 && lastD === 0 && !lastF) return;
  1474.  
  1475.         let targetElm, header, navElm;
  1476.  
  1477.         Promise.resolve().then(() => {
  1478.  
  1479.             targetElm = document.querySelector("#right-tabs");
  1480.             if (!targetElm) return;
  1481.             header = targetElm.querySelector("header");
  1482.             if (!header) return;
  1483.             navElm = document.querySelector('#masthead-container, #masthead')
  1484.             if (!navElm) return;
  1485.             navHeight = navElm ? navElm.offsetHeight : 0
  1486.  
  1487.             let elmY = targetElm.offsetTop
  1488.  
  1489.             let xyz = [elmY + navHeight, pageY, elmY - navHeight]
  1490.  
  1491.             let xyStatus = 0
  1492.             if (xyz[1] < xyz[2] && xyz[2] < xyz[0]) {
  1493.                 // 1
  1494.                 xyStatus = 1
  1495.             }
  1496.  
  1497.             if (xyz[0] > xyz[1] && xyz[1] > xyz[2]) {
  1498.  
  1499.                 //2
  1500.                 xyStatus = 2
  1501.  
  1502.             }
  1503.  
  1504.             if (xyz[2] < xyz[0] && xyz[0] < xyz[1]) {
  1505.                 // 3
  1506.  
  1507.                 xyStatus = 3
  1508.  
  1509.  
  1510.             }
  1511.  
  1512.             return xyStatus;
  1513.  
  1514.         }).then((xyStatus) => {
  1515.  
  1516.             if ((xyStatus == 2 || xyStatus == 3) && (lastD === 0 || lastF)) {
  1517.                 lastD = 1;
  1518.                 let {
  1519.                     offsetHeight
  1520.                 } = header
  1521.                 let {
  1522.                     offsetWidth
  1523.                 } = targetElm
  1524.  
  1525.                 targetElm.style.setProperty("--userscript-sticky-width", offsetWidth + 'px')
  1526.                 targetElm.style.setProperty("--userscript-sticky", offsetHeight + 'px')
  1527.                 
  1528.                 setAttr(targetElm, 'userscript-sticky', true);
  1529.  
  1530.             } else if ((xyStatus == 1) && (lastD === 1 || lastF)) {
  1531.                 lastD = 0;
  1532.  
  1533.                 setAttr(targetElm, 'userscript-sticky', false);
  1534.             }
  1535.  
  1536.  
  1537.             targetElm = null;
  1538.             header = null;
  1539.             navElm = null;
  1540.  
  1541.         })
  1542.  
  1543.     }
  1544. })();
  1545.  
  1546. window.addEventListener("scroll", function() {
  1547.     if(!scriptEnable)return;
  1548.     singleColumnScrolling()
  1549. }, {
  1550.     capture: false,
  1551.     passive: true
  1552. })
  1553.  
  1554. var lastTheatreStatus = 0
  1555. window.addEventListener('resize', function() {
  1556.     if(!scriptEnable)return;
  1557.  
  1558.     requestAnimationFrame(() => {
  1559.         lastF = 1;
  1560.         singleColumnScrolling()
  1561.         lastF = 0;
  1562.     })
  1563.  
  1564. }, {
  1565.     capture: false,
  1566.     passive: true
  1567. })
  1568.  
  1569. window.addEventListener('beforeunload', function() {
  1570.     if(!scriptEnable)return;
  1571.     console.log('beforeunload')
  1572.     resetBeforeNav();
  1573.     let video=document.querySelector('video');
  1574.     if(video && !video.paused) video.pause(); 
  1575. }, {capture: true})
  1576.  
  1577. window.addEventListener('hashchange', function() { 
  1578.     if(!scriptEnable)return;
  1579.     console.log('hashchange')
  1580.     resetBeforeNav();
  1581.   }, {capture: true})
  1582.   
  1583.   window.addEventListener('popstate', function() { 
  1584.     if(!scriptEnable)return;
  1585.     console.log('popstate')
  1586.     resetBeforeNav();
  1587.   }, {capture: true})
  1588.  
  1589.  
  1590. function clearMutationObserver(o, key){
  1591.     if(o[key]) {
  1592.         o[key].takeRecords();
  1593.         o[key].disconnect();
  1594.         o[key]=null;
  1595.     }
  1596. }
  1597.  
  1598. function initMutationObserver(o, key, callback){
  1599.  
  1600.  
  1601.     clearMutationObserver(o,key)
  1602.     o[key]=new MutationObserver(callback)
  1603.  
  1604.  
  1605.  
  1606. }
  1607. /*
  1608.  
  1609. async function resizer(){
  1610.  
  1611. let full=true;
  1612.     (async ()=>{
  1613.         const primaryPlayer=$('ytd-watch-flexy #primary-inner>#player')[0]
  1614.         cssElm.style.setProperty('--userscript-resizing-primary-player-height', primaryPlayer?primaryPlayer.offsetHeight:'')
  1615.         if(!primaryPlayer)full=false;
  1616. })();
  1617.  
  1618.  
  1619. (async ()=>{
  1620.         const primaryInner=$('ytd-watch-flexy #primary-inner')[0]
  1621.         cssElm.style.setProperty('--userscript-resizing-primary-inner-height', primaryInner?primaryInner.offsetHeight:'')
  1622.         if(!primaryInner)full=false;
  1623.     })();
  1624.         
  1625. (async ()=>{
  1626.         const infoContents=$('ytd-watch-flexy #primary-inner>#info>#info-contents')[0]
  1627.         cssElm.style.setProperty('--userscript-resizing-primary-info-height', infoContents?infoContents.offsetHeight:'')
  1628.         if(!infoContents)full=false;
  1629.     })();
  1630.  
  1631.     
  1632. (async ()=>{
  1633.         const metaContents=$('ytd-watch-flexy #primary-inner>#meta>#meta-contents')[0]
  1634.         cssElm.style.setProperty('--userscript-resizing-primary-meta-height', metaContents?metaContents.offsetHeight:'')
  1635.         if(!metaContents)full=false;
  1636.     })();
  1637.  
  1638.     
  1639. (async ()=>{
  1640.     const secondaryInner=$('ytd-watch-flexy #secondary-inner')[0]
  1641.     cssElm.style.setProperty('--userscript-resizing-secondary-inner-height', secondaryInner?secondaryInner.offsetHeight:'')
  1642.     if(!secondaryInner)full=false;
  1643. })();
  1644.  
  1645. }
  1646.  
  1647.  
  1648. window.addEventListener('resize',function(){
  1649.     const cssElm=document.querySelector('ytd-watch-flexy');
  1650.     if(cssElm){
  1651.  
  1652.  
  1653.     }
  1654.     
  1655.     
  1656.  
  1657.    
  1658.  
  1659. }) */
  1660.  
  1661. document.addEventListener('wheel',function(evt){
  1662.     
  1663.     if(!scriptEnable)return;
  1664.     if(displayedPlaylist && displayedPlaylist.contains(evt.target)){
  1665.       evt.stopPropagation(); evt.stopImmediatePropagation()
  1666.     }
  1667. },{capture:true,passive:true});
  1668.  
  1669.  
  1670. function setVideosTwoColumns(flag, bool){
  1671.  
  1672. //two columns to one column
  1673.  
  1674. /*
  1675.     [placeholder-videos] ytd-watch-next-secondary-results-renderer.style-scope.ytd-watch-flexy
  1676.  
  1677.     is-two-columns =""  => no is-two-columns
  1678.     
  1679.     
  1680.     
  1681.     [placeholder-videos] tp-yt-paper-spinner#spinner.style-scope.ytd-continuation-item-renderer
  1682.     
  1683.     no hidden => hidden =""
  1684.     
  1685.     
  1686.     [placeholder-videos] div#button.style-scope.ytd-continuation-item-renderer
  1687.     
  1688.     
  1689.     hidden ="" => no hidden
  1690.     
  1691.  
  1692.     */
  1693.  
  1694.     let cssSelector1='[placeholder-videos] ytd-watch-next-secondary-results-renderer.style-scope.ytd-watch-flexy'
  1695.  
  1696.     let cssSelector2='[placeholder-videos] tp-yt-paper-spinner#spinner.style-scope.ytd-continuation-item-renderer'
  1697.  
  1698.     let cssSelector3='[placeholder-videos] div#button.style-scope.ytd-continuation-item-renderer'
  1699.  
  1700.     let res={}
  1701.     if(flag&1){
  1702.  
  1703.         res.m1=$(cssSelector1)[0]
  1704.     if(bool) $(res.m1).attr('is-two-columns',''); else $(res.m1).removeAttr('is-two-columns')
  1705.     }
  1706.  
  1707.     if(flag&2){
  1708.         res.m2=$(cssSelector2)[0]
  1709.     if(bool) $(res.m2).removeAttr('hidden'); else $(res.m2).attr('hidden','')
  1710.     }
  1711.  
  1712.     if(flag&4){
  1713.         res.m3=$(cssSelector3)[0]
  1714.     if(bool) $(res.m3).attr('hidden',''); else $(res.m3).removeAttr('hidden');
  1715.     }
  1716.  
  1717.  
  1718.     return res
  1719.     
  1720.     
  1721.     
  1722.  
  1723.  
  1724. }
  1725. /*
  1726. document.addEventListener('column1',function(evt){
  1727.  
  1728.     console.log(evt)
  1729.     document.aab=setVideosTwoColumns(1|2|4, false);
  1730. })
  1731. document.addEventListener('column2',function(evt){
  1732.  
  1733.     console.log(evt)
  1734.     document.aab=setVideosTwoColumns(1|2|4, true);
  1735. })
  1736. */
  1737.  
  1738. let lastScrollFetch=0;
  1739. function isScrolledToEnd(){
  1740.     return (window.innerHeight + window.pageYOffset) >= document.scrollingElement.scrollHeight - 2;
  1741. }
  1742. let lastOffsetTop = 0;
  1743. window.addEventListener('scroll',function(evt){
  1744.  
  1745.     //console.log(evt.target)
  1746.  
  1747.     if(!scriptEnable)return;
  1748.  
  1749.  
  1750.     if( !scrollingVideosList ) return;
  1751.  
  1752.  
  1753.  
  1754.     let visibleHeight = document.scrollingElement.clientHeight;
  1755.     let totalHeight = document.scrollingElement.scrollHeight;
  1756.  
  1757.     if(totalHeight<visibleHeight*1.5)return; // filter out two column view;
  1758.  
  1759.     let z=window.pageYOffset+visibleHeight;
  1760.     let h=totalHeight - 40;
  1761.     
  1762.     let h_advanced= h - ((visibleHeight>5*40)?visibleHeight*0.5:0);
  1763.  
  1764.  
  1765.  
  1766.     if(z>h_advanced && !isWideScreenWithTwoColumns() ){
  1767.  
  1768.         if(new Date -  lastScrollFetch<500) return; //prevent continuous calling
  1769.  
  1770.         lastScrollFetch=+new Date;
  1771.     
  1772.         let res= setVideosTwoColumns(2|4, true)
  1773.         if(res.m3 && res.m2){
  1774.  
  1775.             //wait for DOM change, just in case
  1776.             requestAnimationFrame(()=>{
  1777.                 let {offsetTop}=res.m2  // as visiblity of m2 & m3 switched.
  1778.  
  1779.                 if(offsetTop-lastOffsetTop<40) return; // in case bug, or repeating calling.  // the next button shall below the this button 
  1780.                 lastOffsetTop= offsetTop
  1781.  
  1782.                 res.m2.parentNode.dispatchEvent(new Event('yt-service-request-sent-button-renderer'))
  1783.          
  1784.                 res= null
  1785.             }) 
  1786.  
  1787.         }else{
  1788.             
  1789.             res= null
  1790.         }
  1791.  
  1792.  
  1793.     }
  1794.  
  1795.  
  1796.  
  1797.  
  1798. },{passive:true})
  1799.  
  1800.  
  1801.  
  1802.  
  1803.  
  1804.  
  1805.  
  1806.  
  1807.  
  1808.  
  1809.  
  1810.  
  1811.     // https://github.com/cyfung1031/Tabview-Youtube/raw/main/js/content.js
  1812.  
  1813. }
  1814.  
  1815.  
  1816. ;!(function $$() {
  1817.     'use strict';
  1818.  
  1819.     if(document.documentElement==null) return window.requestAnimationFrame($$)
  1820.  
  1821. var cssTxt = GM_getResourceText("contentCSS");
  1822.  
  1823. function addStyle (styleText) {
  1824.   const styleNode = document.createElement('style');
  1825.   styleNode.type = 'text/css';
  1826.   styleNode.textContent = styleText;
  1827.   document.documentElement.appendChild(styleNode);
  1828.   return styleNode;
  1829. }
  1830.  
  1831.  
  1832. addStyle (cssTxt);
  1833.  
  1834.     main(window.$);
  1835.  
  1836.  
  1837.     // Your code here...
  1838. })();