[BUG] bzr revert doesn't preserve the executable bit

[Aaron Bentley]

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John Arbash Meinel wrote:

> But since I can show that a plain 'revert' is failing to detect the
> executable bit change, I think our 'revert' code is just failing to
> chmod the output file.
> 
> Aaron, do you have any time to look at this? It seems like a possible
> regression, and certainly an important bug to fix.

Sure.  Dollars to doughnuts, it *is* _iter_changes, because I rewrote
the core of transform.revert.  I'm just surprised that escaped the test
suite.

Aaron
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