brisbane: initial cut at a mergeline cache

[John Arbash Meinel]

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Andrew Bennetts wrote:
> John Arbash Meinel wrote:
> [...]
>> So there is also a question about how to display revisions that haven't
>> quite-yet been merged into your branch. If you number from source, then
>> they get labeled as though they were merged, and probably end up with
>> the same numbers.
> 
> Why would you be numbering revisions that aren't in your ancestry?  To
> describe a pending merge?
> 
> -Andrew.
> 
> 

Or stuff like "bzr qlog branch1 branch2", yes. Or if you wanted to
consider dead heads in the repository, or ...

John
=:->
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