[Webkit-unassigned] [Bug 89393] New: RenderLayer subtrees without any self-painting layer shouldn't be walked during hit testing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89393

           Summary: RenderLayer subtrees without any self-painting layer
                    shouldn't be walked during hit testing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         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
            Blocks: 89389


Bug 88888 added an optimization to avoid walking such subtrees during painting but it didn't patch the hit testing path.

On http://dglazkov.github.com/performance-tests/biggrid.html, hit testing is suffering from the same over-head as painting: merely traversing a lot of non-self-painting-layers is proving costly. This means hit testing would benefit from the same optimization.

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