[MERGE][BUG #77657] Give a nicer error for non fs_enc() paths

[John Arbash Meinel]

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Aaron Bentley wrote:
> John Arbash Meinel wrote:
>> Bug #77657 is about our inability to add paths that cannot be decoded in
>> the current FS encoding.
> 
>> The attached patch just changes "iter_changes" to give a clear exception
>> about what file is causing the problems (which also removes the ugly
>> traceback.)
> 
> bb:comment
> 
> Couldn't this be applied to all working tree implementations?  That
> would have a benefit for future formats.
> 
> Aaron

True, but then I would have to implement it on all of them. I can look
into moving the test case over to workingtree_impl and see what breaks.
I do agree that it would be nice to preserve the behavior.

John
=:->
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