[Webkit-unassigned] [Bug 143864] New: contentWidth can become negative with nested scrollbars

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143864

            Bug ID: 143864
           Summary: contentWidth can become negative with nested
                    scrollbars
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bjonesbe at adobe.com

Created attachment 251004
  --> https://bugs.webkit.org/attachment.cgi?id=251004&action=review
Test case

This was originally reported in Blink: https://code.google.com/p/chromium/issues/detail?id=450598

This shows up when a percentage shape margin is specified, since the shape margin is computed based on the width of the containing block, and there's an assert that this computation should always return a positive number,

WebKit stack:
ASSERTION FAILED: shapeMargin() >= 0
/Users/bemjb/Code/WebKit/Source/WebCore/rendering/shapes/RectangleShape.cpp(45) : WebCore::FloatRect WebCore::RectangleShape::shapeMarginBounds() const
1   0x111f23d00 WTFCrash
2   0x114cba5ff WebCore::RectangleShape::shapeMarginBounds() const
3   0x114cbad81 WebCore::RectangleShape::shapeMarginLogicalBoundingBox() const
4   0x1137830dc WebCore::Shape::lineOverlapsShapeMarginBounds(WebCore::LayoutUnit, WebCore::LayoutUnit) const
5   0x1151ca0ac WebCore::ShapeOutsideInfo::computeDeltasForContainingBlockLine(WebCore::RenderBlockFlow const&, WebCore::FloatingObject const&, WebCore::LayoutUnit, WebCore::LayoutUnit)
6   0x1149f74af WebCore::LineWidth::shrinkAvailableWidthForNewFloatIfNeeded(WebCore::FloatingObject*)
7   0x114d23b08 WebCore::RenderBlockFlow::positionNewFloatOnLine(WebCore::FloatingObject*, WebCore::FloatingObject*, WebCore::LineInfo&, WebCore::LineWidth&)
8   0x1149db938 WebCore::LineBreaker::skipLeadingWhitespace(WebCore::BidiResolver<WebCore::InlineIterator, WebCore::BidiRun>&, WebCore::LineInfo&, WebCore::FloatingObject*, WebCore::LineWidth&)
9   0x1149dbb80 WebCore::LineBreaker::nextLineBreak(WebCore::BidiResolver<WebCore::InlineIterator, WebCore::BidiRun>&, WebCore::LineInfo&, WebCore::RenderTextInfo&, WebCore::FloatingObject*, unsigned int, WTF::Vector<WebCore::WordMeasurement, 64ul, WTF::CrashOnOverflow>&)
10  0x114d1e4af WebCore::RenderBlockFlow::layoutRunsAndFloatsInRange(WebCore::LineLayoutState&, WebCore::BidiResolver<WebCore::InlineIterator, WebCore::BidiRun>&, WebCore::InlineIterator const&, WebCore::BidiStatus const&, unsigned int)
11  0x114d1d291 WebCore::RenderBlockFlow::layoutRunsAndFloats(WebCore::LineLayoutState&, bool)
12  0x114d21ad0 WebCore::RenderBlockFlow::layoutLineBoxes(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
13  0x114cfa382 WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
14  0x114cf93c8 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
15  0x114cc57c9 WebCore::RenderBlock::layout()
16  0x114cfcbf3 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
17  0x114cfa5e6 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&)
18  0x114cf93eb WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
19  0x114cc57c9 WebCore::RenderBlock::layout()
20  0x114cfcbf3 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
21  0x114cfa5e6 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&)
22  0x114cf93eb WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
23  0x114cc57c9 WebCore::RenderBlock::layout()
24  0x114fefddd WebCore::RenderView::layoutContent(WebCore::LayoutState const&)
25  0x114ff0c3a WebCore::RenderView::layout()
26  0x113eb6bf9 WebCore::FrameView::layout(bool)
27  0x113b16990 WebCore::Document::implicitClose()
28  0x113e806ab WebCore::FrameLoader::checkCallImplicitClose()
29  0x113e8037e WebCore::FrameLoader::checkCompleted()
30  0x113e7ee82 WebCore::FrameLoader::finishedParsing()
31  0x113b23dd3 WebCore::Document::finishedParsing()

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