[Webkit-unassigned] [Bug 140441] [CSSRegions] Assert failure in RenderBlock::locateFlowThreadContainingBlock when showing the render tree debug info

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140441

--- Comment #2 from Andrei Bucur <abucur at adobe.com> ---
Comment on attachment 244601
  --> https://bugs.webkit.org/attachment.cgi?id=244601
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=244601&action=review

> Source/WebCore/rendering/RenderObject.cpp:1398
> +        return downcast<RenderBlock>(*renderer).cachedFlowThreadContainingBlock();

We should also check if the cached value is dirty and return null as well because the value is unreliable.

> Source/WebCore/rendering/RenderObject.cpp:1412
> +            ftcb = flowThreadContainingBlockFromRenderer(containingBlock());

The information in this case may be misleading. Another option would be to display "N/A" instead of some values that may be inaccurate.

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