NEW 198364
[Async overflow scrolling] Backing store attachment logic for composited-inside-scroller needs to account for non-ancestor scrollers 
https://bugs.webkit.org/show_bug.cgi?id=198364
Summary [Async overflow scrolling] Backing store attachment logic for composited-insi...
Simon Fraser (smfr)
Reported 2019-05-29 19:49:38 PDT
We generally inflate the coverage rect for composited scrollers (e.g. bug 198363) so that composited descendants get backing store attachment before they are scrolled into view. However, with a non-stacking context scrollers, descendants don't see the scroller's coverage rect, so we need another way to inflate their coverage.
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Radar WebKit Bug Importer
Comment 1 2019-05-29 19:51:47 PDT
<rdar://problem/51248288>
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