render tree destruction speedup

[Dirk Mueller]

On Thursday 02 October 2003 22:40, David Hyatt wrote:

> Taking advantage of the ability to test for document destruction by
> querying its renderer to avoid doing some extra work...

Sorry to be such a nitpicker, but with all the extremely verbose comments you 
add to very trivial code parts, I'm a bit surprised to see no comment at all 
for this unobvious patch. :-)


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