Hi, Helmut Grohne, I noticed that you reopened this bug report and I suppose you did so because you think that the bug is only partially fixed (as suggested in message #25 [1]).
I just submitted a patch upstream [2] that, to the best of my knowledge, fixes the rest of the problem, but since I'm not a mutt user, could you please confirm that it also works for you? [1] https://bugs.debian.org/615134#25 [2] https://github.com/scop/bash-completion/pull/261