[MERGE][bug 115343] Allow 'bzr branch -r revid:xxx' to branch any revision in ancestry

[Aaron Bentley]

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Aaron Bentley wrote:
> John Arbash Meinel wrote:
> 
>> However the:
>>   branch2 = wt.branch.sprout(repo.bzrdir, revision_id='rev3')
> 
>> I'm much less comfortable with. Having a branch sprout a new branch,
>> without having the revision in its ancestry just feels wrong.

> We can always add new UI stuff later and deprecate the ability to branch
> from a non-ancestral revision, but since it works now, and it's useful
> functionality, let's put it under test.

Here is a version of John's patch that ensures you can branch from any
revision in your repository, not only an ancestral one.

Aaron
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