[MERGE] Optimize single-file diff/revert/etc

[John Arbash Meinel]

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Aaron Bentley wrote:
> Hi all,
> 
> This patch updates Tree._iter_changes so that it performs much faster
> when specific files are specified.
> 
> It tweaks iter_entries_by_dir to avoid walking portions of the tree that
> are not ancestors of specified files.  It does not return entries for
> unspecified files.  This is more complicated than just returning the
> specified entries, but it ensures that ordering requirements are met.
> 
> For the case where a single file is specified, there can be no ordering
> requirements, so that entry is simply returned.
> 
> Aaron

I'm very interested, but you didn't send a patch.

John
=:->
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