[Webkit-unassigned] [Bug 13332] List marker not displayed on items with overflow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=13332


Konstantin Shcheglov <scheglov at google.com> changed:

           What    |Removed                     |Added
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                 CC|                            |scheglov at google.com




--- Comment #9 from Konstantin Shcheglov <scheglov at google.com>  2011-09-27 13:10:42 PST ---
I'm working on this bug  now.

Problem is caused by RenderBox::pushContentsClip().
If DIV has overflow clip, then it is applied before paintObject(), i.e. content.
However RenderListItem::updateMarkerLocation() adds marker to its child DIV (actually parent of first RenderLineBoxList), with negative X coordinate.
But RenderBox::overflowClipRect() includes only rectangle of DIV content, so excludes RenderListMarker painting rectangle. So, marker is not painted if first  child has "overflow: hidden" specified.

I'm not sure how to solve this.
May be change RenderBox::overflowClipRect() to ask (recursively) children to update clip. Only RenderListMarker will do this. Drawbacks:
1. performance hit;
2. may be will cause some problems with leaking content outside of clip because clip will be bigger (on negative side, so probably fine, but still worth to keep in mind).

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