Extend image zoom modes with scale-to-width and scale-to-height of window
当前为 2023-12-25 提交的版本，查看 最新版本。
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Fixed weird behavior in Firefox. Apparently it too now needs a stopPropagation :/
What the fuck, Mozilla? In Firefox 96, document.body.clientHeight always is 0 for pictures. Fixed by using a different source for height.
