[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

Done.

It turned out to be pretty easy to implement for WT2 & 3, so I moved the
test into workingtree_implementations/*.

I thought about putting it into intertree_impl, because it is testing
"iter_changes". However only WTs will have the possibility of
non-unicode paths, because we just can't represent them in
RevisionTrees, etc.

John
=:->
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