[Webkit-unassigned] [Bug 193419] New: Optimize repaints during RenderTreeUpdater::tearDownRenderers()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193419

            Bug ID: 193419
           Summary: Optimize repaints during
                    RenderTreeUpdater::tearDownRenderers()
           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: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

RenderTreeUpdater::tearDownRenderers can delete a whole renderer subtree, and in doing so RenderTreeBuilder::detachFromRenderElement() issues a repaint on (almost) all child renderers.

We should be able to optimize this to just repaint the root renderer's visual overflow rect, as long as we correctly handle out-of-flow descendants.

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