[RFC] merge - common_ancestor generation

[Aaron Bentley]

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Robert Collins wrote:
| On Mon, 2006-03-06 at 21:15 -0500, Aaron Bentley wrote:
|>The graph root should always be the NULL_REVISION, except in cases where
|>the NULL_REVISION is unreachable due to ghosts, in which case we can fail.
|
|
| I think we should not fail in that case, rather report all the ghosts as
| roots (they are) and let the caller decide what they want to do -
| whether to synthesis a common ancestor, or to work off the known graph.

Okay, I agree that this is better as we move forward.


| Can you confirm this matches what we spoke about?

Yes, this looks right.

Aaron
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