revert/shelf/undo/redo

[Aaron Bentley]

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Matthieu Moy wrote:
> So, this means the "changeset" contains the revision id of the its
> base revision (no problem). It also means that the base revision must
> be available to the recipient.

Yes, and any revision can be used as the changeset-base (including the
null revision), because the changeset base isn't the same thing as the
merge base.

> I guess it's not possible directly to send one
> particular patch among an unpublished branch (the workaround being to
> create a "submission branch", to cherrypick the desired patch in it,
> and then to send the patch for this submission branch).

Right.  Perhaps we could automate the workaround.  On the other hand,
bzr's support for merging with cherrypicks is quite weak at the moment,
so we don't want to encourage cherrypicking.

Aaron
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