[Dovecot] Patch proposition to implement a new workaround: tb-lsub-flags

[Bruno Tréguier]

Hi again Timo,

As agreed earlier tonight, you'll find as attachments 4 diffs (diff -u) 
implementing the new workaround "tb-lsub-flags".

The 4 impacted files are:

./src/imap/imap-settings.h
./src/imap/imap-settings.c
./src/imap/cmd-list.c
./src/config/all-settings.c

Here is the proposed description for the dovecot.conf file:

#   tb-lsub-flags:
# Usually IMAP servers don't bother returning the flags attached
# to each mailbox, but Thunderbird presently needs them in order
# to correctly process the "folders of folders" case.


Please tell me if the patch format is suitable or if you expect 
something else.

Best regards and thanks again for your responsiveness.

Bruno

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