[Webkit-unassigned] [Bug 77369] New: Introduce a no-repaint-expected flag

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77369

           Summary: Introduce a no-repaint-expected flag
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P3
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: simon.fraser at apple.com, jamesr at chromium.org,
                    nduca at chromium.org


We have been seeing some instances of over-repainting, especially with accelerated compositing enabled (see bug 50417 for example). Our current strategy to avoid regressions was to write a repaint test in those cases.

While it does work, it may miss some cases where we really shouldn't be repainting. Layout has a similar flag (RenderObject setNeedsLayoutIsForbidden) which makes me think it would be worthwhile.

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