maildir: remove filename encoded UID when moving messages

The built-in maildir.Dir.Move method performs an OS level file rename,
which allows for preserving file creation time. Commit c98f70487417
("move: enable MoveMessages from msgstore") enabled the use of the Move
method for maildir. One particular maildir synchronizer (isync/mbsync)
encodes the UID within the filename of the email and cannot recover if
the UID is preserved during a move. mbsync encodes filenames like so:

	/path/to/email/{maildir-key},U={uid}:2,S

OfflineIMAP encodes the UID within the filename, but also encodes a hash
of the originating folder so that it can recover from a move without a
rename of the underlying file. OfflineIMAP encodes like so:

	/path/to/email{maildir-key},U={uid},FMD5={folder-hash}:2,S

Remove encoded UIDs of the form `,U={uid}` from filenames to prevent
sync issues.

Fixes: https://todo.sr.ht/~rjarry/aerc/75
Fixes: c98f70487417 ("move: enable MoveMessages from msgstore")
Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Robin Jarry <robin@jarry.cc>

0 files changed, 0 insertions, 0 deletions