[Webkit-unassigned] [Bug 41267] New: Scrolling slows down to crawl with a selection (RenderBlock::fillSelectionGaps)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=41267

           Summary: Scrolling slows down to crawl with a selection
                    (RenderBlock::fillSelectionGaps)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://www.guardian.co.uk/football/2010/jun/27/germany
                    -england-world-cup-2010?showallcomments=true#comment-5
                    1
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: koivisto at iki.fi


On Safari 5. To repro:

1) Go to http://www.guardian.co.uk/football/2010/jun/27/germany-england-world-cup-2010?showallcomments=true#comment-51
2) Select a word from a comment (selecting something from the main text does not repro the problem)
3) Scroll the document

Scrolling is very slow. Removing the selections gets everything back to normal.

>From sample:
...
1793 WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int)
  1759 WebCore::RenderBlock::paintSelection(WebCore::RenderObject::PaintInfo&, int, int)
    1752 WebCore::RenderBlock::fillSelectionGaps(WebCore::RenderBlock*, int, int, int, int, int&, int&, int&, WebCore::RenderObject::PaintInfo const*)
      1752 WebCore::RenderBlock::fillBlockSelectionGaps(WebCore::RenderBlock*, int, int, int, int, int&, int&, int&, WebCore::RenderObject::PaintInfo const*)
        1752 WebCore::RenderBlock::fillSelectionGaps(WebCore::RenderBlock*, int, int, int, int, int&, int&, int&, WebCore::RenderObject::PaintInfo const*)
          1743 WebCore::GraphicsContext::clipOut(WebCore::IntRect const&)
            1701 CGContextGetClipBoundingBox
              1699 get_device_clip_bounding_box
                1698 CGGStateGetClipBoundingBox
                  1698 CGClipStackGetBounds
                    1226 CGClipGetBounds
                      1035 CGPathGetBoundingBox
                      191 CGClipGetBounds

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