Upstream: https://we.phorge.it/T15749
Copying from https://bugzilla.mozilla.org/show_bug.cgi?id=863326 :
I like that Launchpad.net shows the following warning above the comment field for bug reports closed as duplicates to logged-in users.
Could save some time when triaging to have something like:
This task is a duplicate of T1234567. Comment here only if you think that it is not a duplicate.
Because things happen, e.g. https://phabricator.wikimedia.org/T362010#9695138