[MERGE] Fix PreviewTree.annotate

John Arbash Meinel john at arbash-meinel.com
Wed Jul 2 18:08:29 BST 2008

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Just layering a annotate.reannotate() on top of extracting the text IFF 
the text should have changed. Seems good.

Though you don't test annotate_iter() when there are no changes. I would 
like you to, just to exercise more code paths.

And maybe also if you change something which *isn't* a content change. 
Like maybe renaming the file?
Basically, I would like to make sure that each branch in the code is at 
least passed over. (Helps to find typos, etc.)

For details, see: 

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