Enhancement to also use the external diff tool for new and deleted files.

[Aaron Bentley]

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David Ingamells wrote:
>> Renames and moves might also need console output in a visual mode and
>> even a
>> tree diff may not usefully report what has actually been done so those
>> are also tricky.

I just remembered another edge case, related to your original patch: A
file may be deleted, yet its name may exist in the new tree.

For example:

bzr init foo
touch foo/bar
bzr add foo/bar
bzr commit -m "added file"
bzr remove --keep foo/bar
bzr add foo/bar
bzr commit -m "re-added file"

This should show as though bar was deleted and added, in the same diff.

Aaron
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