Bug 164629 – RenderObject::flowThreadState should follow containing block instead of parent.

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[zalan]

Column boxes act as the containing block for their content. That is, column boxes behave like block-level, table cell, and inline-block boxes as per CSS 2.1, section 10.1, item 2 [CSS21]. However, column boxes do not establish containing blocks for elements with ‘position: fixed’ or ‘position: absolute’.
https://www.w3.org/TR/css3-multicol/

[zalan]

Created attachment 294469 [details]
Patch

[zalan]

^^WIP patch

[zalan]

Created attachment 294497 [details]
Patch

[zalan]

Created attachment 294590 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 294590 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=294590&action=review

> Source/WebCore/ChangeLog:12
> +        try to handle this seemingly defective state gracefully (that is flag indicates "inside the flow thread" state,

"that is flag indicates": hard to parse. Do you mean "that is, the flag indicates", or "that the flag indicates"?

> Source/WebCore/rendering/RenderElement.cpp:2198
> +    for (auto& descendant : descendantsOfType<RenderObject>(*this))

Is there a more elegant way to say descendantsOfType<RenderObject> (i.e. all descendants)?

> Source/WebCore/rendering/RenderElement.cpp:2199
> +        descendant.setFlowThreadState(RenderObject::computedFlowThreadState(descendant));

Why can't setFlowThreadState() contain the code for (or call) computedFlowThreadState(), since you always pass the same renderer?

[zalan]

Created attachment 294629 [details]
Patch

[zalan]

> > Source/WebCore/rendering/RenderElement.cpp:2199
> > +        descendant.setFlowThreadState(RenderObject::computedFlowThreadState(descendant));
> 
> Why can't setFlowThreadState() contain the code for (or call)
> computedFlowThreadState(), since you always pass the same renderer?
setFlowThreadState() has many callsites where we just pass an enum value in.

[WebKit Commit Bot]

Comment on attachment 294629 [details]
Patch

Clearing flags on attachment: 294629

Committed r208661: <http://trac.webkit.org/changeset/208661>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.