[Webkit-unassigned] [Bug 122754] New: Region based multicol: Child top margin sometimes ignored for column balancing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=122754

           Summary: Region based multicol: Child top margin sometimes
                    ignored for column balancing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mstensho at opera.com


During the first layout pass, the code incorrectly believes that the element ends up in the next column (or page), and eats the margin. Apart from broken layout, this may even cause an assertion failure:

ASSERTION FAILED: currentMinSpaceShortage != LayoutUnit::max()
../../Source/WebCore/rendering/RenderMultiColumnSet.cpp(112) : bool WebCore::RenderMultiColumnSet::calculateBalancedHeight(bool)

... because the column heights don't become tall enough in the initial balancing pass.

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