isAncestor patch

[Darin Adler]

While doing work on editing, we accidentally reversed the behavior of 
isAncestor, breaking checkAddChild. This patch flips it back. You won't 
need to apply it to KHTML in KDE, because presumably you didn't roll in 
the broken isAncestor, but if you intended to roll in some of the other 
new code that uses isAncestor, you'll want to revise them as per this 
patch.

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     -- Darin