render tree destruction speedup

[Dirk Mueller]

On Saturday 04 October 2003 18:20, Dirk Mueller wrote:

> > Yeah, I should add some comments.  That isn't exactly obvious.
> patch?

Hmm, no followup. I've been looking around and I think 
RenderObject::removeFromObjectLists() could gain something from such a check 
as well. I've applied it locally here and it survived initial testing.


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