Problem: filetype: mbsyncrc files are not recognized
Solution: detect isyncrc and "*.mbsyncrc" files as mbsync filetype,
include filetype and syntax plugin (Pierrick Guillaume)
mbsync is a command line application which synchronizes mailboxes;
currently Maildir and IMAP4 mailboxes are supported.
New messages, message deletions and flag changes can be propagated both ways;
the operation set can be selected in a fine-grained manner.
References:
mbsync syntax overview: mbsync manual (isync v1.4.4)
https://isync.sourceforge.io/mbsync.html
Upstream support for the mbsync filetype.
Original plugin: https://github.com/Fymyte/mbsync.vimcloses: vim/vim#17103836b87d699
Co-authored-by: Pierrick Guillaume <pguillaume@fymyte.com>
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