[Webkit-unassigned] [Bug 47391] Fix scrolling of noncomposited iframes within composited document

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47391





--- Comment #11 from Simon Fraser (smfr) <simon.fraser at apple.com>  2010-10-17 19:54:19 PST ---
Here's the stack where the problem occurs:

#1  0x0000000100203302 in WebKit::ChunkedUpdateDrawingArea::scroll
#2  0x0000000100248037 in WebKit::WebChromeClient::scroll
#3  0x0000000100fa1129 in WebCore::Chrome::scroll
#4  0x00000001012bd06b in WebCore::FrameView::scrollContentsFastPath
#5  0x00000001019e6808 in WebCore::ScrollView::scrollContents
#6  0x00000001019e6a1e in WebCore::ScrollView::valueChanged
#7  0x00000001012bcccc in WebCore::FrameView::valueChanged
#8  0x00000001019dd6b4 in WebCore::Scrollbar::setCurrentPos
#9  0x00000001019dd867 in WebCore::Scrollbar::setValue

The bug is that ScrollView::scrollContents() always call through to hostWindow to invalidate on scrolling. If the iframe is composited, it needs to repaint via a RenderObject.

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