Commits on Dec 17, 2019

1. Fix manual scrolling issue on Firefox/Windows …

   Fixes mastodon#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…

   

   ClearlyClaire committed Dec 17, 2019
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