lib-storage: Moved some items from mailbox_get_status() to a new mailbox_get_metadata(). The idea is now that all status items are tracked all the time after mailbox is opened and they can always be looked up without failure. The metadata items are looked up lazily and the lookups may fail at any time. mailbox_get_status() can be used after mailbox_alloc() to indicate that the mailbox doesn't necessarily have to be opened, just that the status fields get returned. If mailbox is already known to be open, mailbox_get_open_status() can be used. It never fails.

--- a/src/imap/imap-client.h	Wed Dec 29 11:43:01 2010 +0200
+++ b/src/imap/imap-client.h	Sat Jan 01 15:52:39 2011 +0200
@@ -192,7 +192,7 @@
    have to wait for an existing SEARCH SAVE to finish. */
 bool client_handle_search_save_ambiguity(struct client_command_context *cmd);
 
-void client_enable(struct client *client, enum mailbox_feature features);
+int client_enable(struct client *client, enum mailbox_feature features);
 
 struct imap_search_update *
 client_search_update_lookup(struct client *client, const char *tag,