[MERGE] Improve tests for the behaviour of Tree.iter_changes for missing paths that are only present in one tree, and fix found bugs. (Robert Collins)

[Aaron Bentley]

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Robert Collins wrote:
> (Or to put it another way, I don't like TestNotApplicable all that
> much, because 'raise' and 'not a problem' just don't fit in my head).

So then, consider it a problem that a test was run which it did not make
sense to run.

Aaron
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