Comment 0 for bug 137408

If a bug report is marked as a duplicate, Launchpad (almost completely) prevents people from changing the report's context(s), status(es), or importance(s), because there is no longer any point in doing those things.

However, Launchpad also prevents people from changing the bug report's assignees, and this causes unwanted bugmail if chatter continues in the bug report.

Ways we could fix this:
1. Prohibit comments in duplicate bug reports. But this would mean that discussions about whether a report really was a duplicate would happen in the original instead, which would both inconvenience subscribers to the duplicate, and annoy subscribers to the original.
2. Not send out any bugmail for duplicate bug reports. But this would make any legitimate discussion about whether the report was really a duplicate much less effective.
3. Let assignees to duplicates unassign themselves.