139245 2014-12-03 17:20:56 -0800 Programmatic scrolling and content changes are not always synchronized 2014-12-05 17:25:04 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 simon.fraser simon.fraser andersca cmarcelo commit-queue jamesr luiz simon.fraser thorton tonikitoo webkit-bug-importer oldest_to_newest 1052361 0 simon.fraser 2014-12-03 17:20:56 -0800 Content that changes the scroll offset, and changes the style of an element at the same time should be able to make that element appear in a fixed position. However, for some reason WebKit is unable to always synchronize the two, and the element flickers. 1052362 1 simon.fraser 2014-12-03 17:21:14 -0800 rdar://problem/18833612 1052891 2 simon.fraser 2014-12-05 16:05:44 -0800 Even when programmatic scrolling, AsyncScrollingCoordinator::requestScrollPositionUpdate() sends the scroll off to the scrolling thread, which sometime later tells the UI thread that we scrolled in AsyncScrollingCoordinator::scheduleUpdateScrollPositionAfterAsyncScroll(), which (on a timer) hits AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll(). 1052930 3 242685 simon.fraser 2014-12-05 17:04:50 -0800 Created attachment 242685 Patch 1052940 4 simon.fraser 2014-12-05 17:25:04 -0800 https://trac.webkit.org/r176899 242685 2014-12-05 17:04:50 -0800 2014-12-05 17:06:50 -0800 Patch bug-139245-20141205170525.patch text/plain 9402 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogMTc2NzY0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D 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