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Merge pull request #6880 from matrix-org/rav/fix_autoscroll

pull/21833/head
Germain 2021-09-29 12:29:17 +01:00 committed by GitHub
parent a811df4786 c99216814f
commit c3bac33b9d
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1 changed files with 9 additions and 2 deletions
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src/components/structures/ScrollPanel.tsx
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@ -277,8 +277,15 @@ export default class ScrollPanel extends React.Component<IProps> {
// fractional values (both too big and too small) // fractional values (both too big and too small)
// for scrollTop happen on certain browsers/platforms // for scrollTop happen on certain browsers/platforms
// when scrolled all the way down. E.g. Chrome 72 on debian. // when scrolled all the way down. E.g. Chrome 72 on debian.
// so check difference <= 1; //
return Math.abs(sn.scrollHeight - (sn.scrollTop + sn.clientHeight)) <= 1; // We therefore leave a bit of wiggle-room and assume we're at the
// bottom if the unscrolled area is less than one pixel high.
//
// non-standard DPI settings also seem to have effect here and can
// actually lead to scrollTop+clientHeight being *larger* than
// scrollHeight. (observed in element-desktop on Ubuntu 20.04)
//
return sn.scrollHeight - (sn.scrollTop + sn.clientHeight) <= 1;
}; };
// returns the vertical height in the given direction that can be removed from // returns the vertical height in the given direction that can be removed from