[Webkit-unassigned] [Bug 198664] New: REGRESSION (r244182) [WK1]: Page updates should always scheduleCompositingLayerFlush() immediately

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198664

            Bug ID: 198664
           Summary: REGRESSION (r244182) [WK1]: Page updates should always
                    scheduleCompositingLayerFlush() immediately
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

WK1 is a single process which means the UI and the core functionalities are in the same process. If the page scrolls, it will needs update so it does scheduleRenderingUpdate(). scheduleRenderingUpdate() times calling the scheduleCompositingLayerFlush() via the DisplayRefreshMonitor. This timing on a single process makes the frame to be missed almost always. Therefore scrolling in WK1 is stuttering.

Servicing rAF callbacks, WebAnimations, IntersectionObserver and ResizeObserver still have to time the next RenderingUpdate through DisplayRefreshMonitor as it is currently implemented.

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