RFC: Possibility to re-edit last commit message

[Aaron Bentley]

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John Arbash Meinel wrote:
> I always thought of this as a "bzr recommit" command.

> Definitely, I wouldn't want one that just rewrote the revision entry's
> message field. It would need to create a new commit.

I think "bzr recommit" may not indicate clearly enough that recommitting
removes the last-revision.

One way to prevent this from becoming problematic would be to mark the
last-revision as a merge, because tools would be able to treat the new
last-revision as effectively equal to the old last-revision.

The downside is that marking it as a merge would make the old, undesired
log message appear in long-format logs, which probably defeats the purpose.

Aaron
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