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Fix manual scrolling issue on Firefox/Windows (#12648)

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Fixes #12607

`will-change: transform` apparently makes manual scrolling impossible on
Firefox/Windows. While this should probably be considered a Firefox bug,
`will-change: transform` seem like a very aggressive performance hint that
may possibly make the browser consume more resources than needed, especially
in multiple-column mode.

This was originally added to improve scrolling performances on mobile, but
I think this isn't necessary anymore, because of the two following reasons:
- `contain: paint` (which is implied by `contain: strict`, which we apply
  whenever the browser supports grids) should have similar effects
- in single-column mode, the scrolling container is the root element, which
  I believe is optimized in at least Chromium

Keep in mind that I have not been able to make in-depth benchmarks, and
especially not been able to try on mobile, so performances should probably
be investigated further…
This commit is contained in:
ThibG 2019-12-19 12:47:19 +01:00 committed by Eugen Rochko
parent a90258dbe9
commit dc0750abc3
1 changed files with 0 additions and 1 deletions
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app/javascript/styles/mastodon/components.scss
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@ -2512,7 +2512,6 @@ a.account__display-name {
overflow-x: hidden; overflow-x: hidden;
flex: 1 1 auto; flex: 1 1 auto;
-webkit-overflow-scrolling: touch; -webkit-overflow-scrolling: touch;
will-change: transform; // improves perf in mobile Chrome
&.optionally-scrollable { &.optionally-scrollable {
overflow-y: auto; overflow-y: auto;