[Webkit-unassigned] [Bug 194289] Glitch-free async scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194289

--- Comment #10 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
There's another tricky piece to having the scrolling tree inputs be scroll position-independent for layers inside overflow scroll: for a positioned layer whose position is affected by overflow scrolling, that position is a factor of both container scroll position and other CSS positioning. If we were to do as this bug proposes, updating geometry on such layers in a normal compositing update would have to be followed by running the scrolling tree layer positioning logic. So every compositing update would have to be followed by a scrolling tree pass. Maybe not terrible, but some additional complexity.

Right now, avoiding jank on such layers is done via the ScrollingLayerPositionAction::Sync stuff, which is also error-prone.

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