view debian/compat @ 2649:cf930521f14d

topics: add some noise to rewrittent changeset to prevent hash cycle

If we have a changeset with topic `x`, we change it's topic to `y`, fine.
When we change it's topic back again to `x`, we get the hash of the the
obsoleted changeset which had the topic `x` initially. The same happens for few
more cases like clearing the topic of a changeset which initially had no topic.

This approach is influenced from cmdutil.amend and other commands (rebase, histedit, etc…)

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