moving branch nick recording out of Commit, into WorkingTree

[Aaron Bentley]

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Robert Collins wrote:
| It should be possible to record commits with no branch nickname - not an
| empty one, a non existent one.

I'm not sure I agree.  Could you expand on why?

| I think the easiest way is to think of recording the nick as policy and
| move it up to the WorkingTree commit wrapper. Then tools like baz2bzr
| that both have no nickname and no good way to set it can commit without
| one by creating a Commit() object directly.

Why is setting it on the branch not a good way to set it?

Wouldn't the arch version be a great branch nick?

Aaron
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