[MERGE] 40% faster partial commits

[Alexander Belchenko]

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Robert Collins пишет:
> This makes partial commits walk much less data, with approximately 40%
> increase in speed.
> 
> The basic approach is to use the iter_entries_by_dir specific_file_ids
> parameter, after tweaking it to optionally match the behaviour wanted by
> commit.

bb:comment

Partial commit has serious bug: https://bugs.launchpad.net/bugs/140419
Does your patch handle this case?

[µ]
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