Emacs has several standard keybindings
C-x m compose-mail
C-x 4 m compose-mail-other-window
C-x 5 m compose-mail-other-frame
This patch fixes the creation of new mail buffers to respect the
latter two keybindings, C-x 4 m and C-x 5 m.
Note that there is already the variable mu4e-compose-in-new-frame
which if true opens in a new frame. That will still work for C-x m
and C-x 5 m, but if the user runs C-x 4 m, it switches to other-window
as it assumes the keybinding takes precedence. This behaviour can be
changed within mu4e~draft-open-file.
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