RenderTable::section{Above,Below}() can return the wrong answer for the {footer,header}

RenderTable::sectionAbove() and sectionBelow() skip the last/first child when you ask for the section adjacent to the footer/header. (I ran into this problem while working on another patch and I don't want to include the fix in that patch since it involves updating the results of many Mozilla table tests).

Created attachment 12257 [details]
Patch

[Darin Adler]

Comment on attachment 12257 [details]
Patch

I think resetSectionPointerIfNotBefore needs an assertion that o is a table section as the caption code does that o is a RenderBlock; in fact, I'm not at all sure that there's a guarantee that o is a RenderBlock.

Otherwise r=me.

Created attachment 12273 [details]
Patch

(In reply to comment #2)
> (From update of attachment 12257 [details] [edit])
> I think resetSectionPointerIfNotBefore needs an assertion that o is a table
> section as the caption code does that o is a RenderBlock; in fact, I'm not at
> all sure that there's a guarantee that o is a RenderBlock.

The assignments of o (to ptr and to m_caption) where either no-ops or 0 assignments. I changed things to not do the no-op and to make the 0 assignment explicit, so no cast is needed.

[Darin Adler]

Comment on attachment 12273 [details]
Patch

+                        m_firstBody = static_cast<RenderTableSection*>(child);

Looks like this is indented too far.

Looks great to me. r=me, but needs review by Hyatt too.

Created attachment 12304 [details]
Patch

Fixed indentation.

[Dave Hyatt]

Comment on attachment 12304 [details]
Patch

r=me

[Mark Rowe (bdash)]

Landed in r18791.