[Webkit-unassigned] [Bug 107326] Rubberband scrolling on news.google.com causes text to blink repeatedly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107326





--- Comment #6 from Simon Fraser (smfr) <simon.fraser at apple.com>  2013-01-29 20:32:13 PST ---
Ah, we're actually inside layout at that point:

* thread #1: tid = 0x2303, 0x00000001049d14a3 WebCore`WebCore::RenderLayerCompositor::requiresCompositingForPosition(WebCore::RenderObject*, WebCore::RenderLayer const*, WebCore::RenderLayer::ViewportConstrainedNotCompositedReason*) const + 755 at RenderLayerCompositor.cpp:2079, stop reason = breakpoint 8.1
    frame #0: 0x00000001049d14a3 WebCore`WebCore::RenderLayerCompositor::requiresCompositingForPosition(WebCore::RenderObject*, WebCore::RenderLayer const*, WebCore::RenderLayer::ViewportConstrainedNotCompositedReason*) const + 755 at RenderLayerCompositor.cpp:2079
    frame #1: 0x00000001049cc41d WebCore`WebCore::RenderLayerCompositor::requiresCompositingLayer(WebCore::RenderLayer const*, WebCore::RenderLayer::ViewportConstrainedNotCompositedReason*) const + 381 at RenderLayerCompositor.cpp:1645
    frame #2: 0x00000001049ccdba WebCore`WebCore::RenderLayerCompositor::needsToBeComposited(WebCore::RenderLayer const*, WebCore::RenderLayer::ViewportConstrainedNotCompositedReason*) const + 74 at RenderLayerCompositor.cpp:1621
    frame #3: 0x00000001049cc937 WebCore`WebCore::RenderLayerCompositor::updateBacking(WebCore::RenderLayer*, WebCore::RenderLayerCompositor::CompositingChangeRepaint) + 71 at RenderLayerCompositor.cpp:566
    frame #4: 0x00000001049cd0e3 WebCore`WebCore::RenderLayerCompositor::updateLayerCompositingState(WebCore::RenderLayer*, WebCore::RenderLayerCompositor::CompositingChangeRepaint) + 35 at RenderLayerCompositor.cpp:659
    frame #5: 0x000000010499b293 WebCore`WebCore::RenderLayer::updateScrollInfoAfterLayout() + 435 at RenderLayer.cpp:3097
    frame #6: 0x0000000104864444 WebCore`WebCore::RenderBlock::updateScrollInfoAfterLayout() + 180 at RenderBlock.cpp:1349
    frame #7: 0x0000000104865a0b WebCore`WebCore::RenderBlock::layoutBlock(bool, WebCore::LayoutUnit) + 2779 at RenderBlock.cpp:1589
    frame #8: 0x00000001048644ce WebCore`WebCore::RenderBlock::layout() + 126 at RenderBlock.cpp:1363
    frame #9: 0x0000000103bb8db6 WebCore`WebCore::RenderObject::layoutIfNeeded() + 54 at RenderObject.h:676
    frame #10: 0x0000000104868cb4 WebCore`WebCore::RenderBlock::layoutPositionedObjects(bool, bool) + 724 at RenderBlock.cpp:2711
    frame #11: 0x000000010486619e WebCore`WebCore::RenderBlock::simplifiedLayout() + 574 at RenderBlock.cpp:2604
    frame #12: 0x000000010486500a WebCore`WebCore::RenderBlock::layoutBlock(bool, WebCore::LayoutUnit) + 218 at RenderBlock.cpp:1485
    frame #13: 0x00000001048644ce WebCore`WebCore::RenderBlock::layout() + 126 at RenderBlock.cpp:1363
    frame #14: 0x0000000104b3ad54 WebCore`WebCore::RenderView::layoutContent(WebCore::LayoutState const&) + 116 at RenderView.cpp:131
    frame #15: 0x0000000104b3b54c WebCore`WebCore::RenderView::layout() + 1148 at RenderView.cpp:215
    frame #16: 0x0000000103c4825d WebCore`WebCore::FrameView::layout(bool) + 3261 at FrameView.cpp:1213
    frame #17: 0x00000001038f37d6 WebCore`WebCore::Document::updateLayout() + 374 at Document.cpp:1892
    frame #18: 0x00000001049a0edd WebCore`WebCore::RenderLayer::hitTest(WebCore::HitTestRequest const&, 

RenderBlock::updateScrollInfoAfterLayout() is causing premature compositing stuff to happen inside layout.

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