[MERGE][#56299] New option -C/--change for diff and status to show changes in one revision.

[Aaron Bentley]

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Lukáš Lalinský wrote:
> On So, 2007-08-25 at 10:35 -0400, Aaron Bentley wrote:
> +def _parse_change_str(revstr):
> +    if '..' in revstr:
> +        raise errors.RangeInChangeOption()
> +    return (revisionspec.RevisionSpec.from_string('before:' + revstr),
> +            revisionspec.RevisionSpec.from_string(revstr))

Unfortunately, '..' doesn't always indicate a range.  For example, "bzr
diff -r branch:../bzr.dev".

I think you probably need to parse -c as though it was -r and raise an
error if there are two revision specs in the result.

Aaron
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