Virtual folders and mailbox_list_get_root_forced

Hi

The function mailbox_list_get_root_forced returns sometimes the first or the second value of the INDEX param for the same mailbox.

How to make sure this returns only the correct one of the corresponding mailbox ?

mail_location = maildir:/var/vmail/%d/%n:LAYOUT=fs:INDEX=/var/mailindex namespace { location = virtual:/nix/store/toto-virtual:INDEX=/var/vmail/%d/%n/virtual prefix = virtual/ separator = / subscriptions = no }

Thank you