[Webkit-unassigned] [Bug 99741] New: Generate only on repaint call per subtree detaching

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99741

           Summary: Generate only on repaint call per subtree detaching
           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: eric at webkit.org, hyatt at apple.com, darin at apple.com,
                    mitz at webkit.org, simon.fraser at apple.com
            Blocks: 92697


Now that bug 98336 has landed, we can use the top-down implementation to avoid generating a repaint for each child removal. This is currently the case due to RenderObjectChildList::removeChild (see http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderObjectChildList.cpp#L75).

This can work as we track the visual overflow during layout so the root's clippedOverflowRectForRepaint includes the children's overflow. There are some exceptions to that though: the example being positioned object way outside it's containing block's box as including them would yield to too overpainting.

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