tsuflux [1] filed a deletion request for mutt-sidebar [2]:
extra/mutt now includes the sidebar (and trash). This package is no longer needed.
[1] https://aur.archlinux.org/account/tsuflux/ [2] https://aur.archlinux.org/pkgbase/mutt-sidebar/
Request #6226 has been accepted by Dragonlord [1].
aur-requests@lists.archlinux.org