194996 2019-02-24 21:32:14 -0800 Scrolling tree should do an update after layer flushing on macOS 2019-03-12 20:04:27 -0700 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 195507 P2 Normal --- 1 simon.fraser webkit-unassigned fred.wang koivisto simon.fraser oldest_to_newest 1509539 0 simon.fraser 2019-02-24 21:32:14 -0800 The scrolling tree contains the latest scrolling-related state for layers managed by the scrolling tree. When the main thread flushes compositing layers, it might flush layer positions that are stale in relation to the scrolling thread state. We currently (mostly) avoid jank here by the tricky "set or sync" logic, and "isInUserScroll" state, but it would be simpler to just have the scrolling tree do a pass after layer flushing. 1509540 1 simon.fraser 2019-02-24 21:33:01 -0800 On iOS we already do this by pushing the current layoutViewportRect through the scrolling coordinator in the UI process, after receiving a transaction. 1515847 2 simon.fraser 2019-03-12 20:04:27 -0700 *** This bug has been marked as a duplicate of bug 195507 ***