[MERGE][0.15] Speed up 'bzr status' in xml trees

[Aaron Bentley]

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John Arbash Meinel wrote:

>> It might give a speed boost to switch the basis format back to 5,
>> because then it can use the repository inventory text verbatim.
>>
> 
> It probably would make sense to do so for everything that isn't
> 'dirstate-with-subtree'. But at this point I don't know that it is worth
> the effort.

I suspect the effort is smaller than what you've already put into speedups.

> 
>>> PS> I'm still getting failures for blackbox.test_merge_directive because
>>> I don't have an SMTP host running on the local machine. Did we only fix
>>> the non-blackbox test?
>> Dunno.  I can check.

We only "fixed" the blackbox test.  We invoke smtplib from
cmd_merge_directive, so there's no non-blackbox test.

Aaron
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