Mutt folder completion broken (removes '=' sign after completing)

[antoszka]

As in the subject, when I complete mutt folder names (in the mutt nomenclature, with the leading '=' sign), the sign gets removed:

mutt -f =foo<tab>

gets a full or partial completion, but removes the '=' sign, resulting in a useless result:

mutt -f foobar

This used to work properly.

[antoszka]

Any updates here? :)