lib-storage: Optimize mailbox_exists() with mailbox_list_index=yes We can return the existence from the index itself to avoid stat()s.
lib-storage: Optimize mailbox_exists() with mailbox_list_index=yes
We can return the existence from the index itself to avoid stat()s.

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot