[BUNDLE] Give a revision-id to get_revision_delta.

[Aaron Bentley]

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Robert Collins wrote:
> On Wed, 2006-06-07 at 18:08 +0100, Aaron Bentley wrote:
>> You've also changed the semantics
>> slightly, because the leftmost parent may not be the mainline predecessor.

> Given that we normalise history now, and are looking at removing the
> revision-history file contents, is this much of an issue ?

If we're committing to always normalizing history, e.g. in log, then I
have no problem with this as one of the steps.

Aaron
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