[MERGE][BUG] 51980: bzr log <file>returns inappropriate revisions

[Kent Gibson]

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The attached patch is a fix for bug 51980 and 69477.

Sorry about the unfortunate timing on this one.
I don't intend it for 0.15, I just wanted to get it out there to see
if the approach is valid.

The fix was inspired by loggerhead.  I wasn't sure that the file
change history it was listing was correct, and ran into #51980 while
trying to compare it to bzr log.
I ended up borrowing a couple of lines from loggerhead in the fix
(Robey you might notice some similarity to
get_short_revision_history_by_fileid.  I hope that is ok with you).

The resulting fix is also much faster than the old (broken) version.
On my machine ``bzr log NEWS`` now completes in 2-3sec, compared to
~100sec.
As such I think it also fixes bug 69477.

Cheers,
Kent.


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