[balsa/gtk3] Check that mailbox is still open

[Peter Bloomfield <PeterB src gnome org>]

commit 1a7a163ca40c960e940dd3b8baf74b27f1ccd544
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon Feb 25 18:22:35 2013 -0500

    Check that mailbox is still open
    
        * libbalsa/mailbox.c (lbm_msgno_filt_check): check that mailbox
        is still open.

 ChangeLog          |    5 +++++
 libbalsa/mailbox.c |    7 +++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 366eea2..e683dc5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-02-25  Peter Bloomfield
 
+       * libbalsa/mailbox.c (lbm_msgno_filt_check): check that mailbox
+       is still open.
+
+2013-02-25  Peter Bloomfield
+
        * libbalsa/mailbox.c (libbalsa_mailbox_search_iter_ref): allow
        NULL iter.
 
diff --git a/libbalsa/mailbox.c b/libbalsa/mailbox.c
index d8729eb..f363b21 100644
--- a/libbalsa/mailbox.c
+++ b/libbalsa/mailbox.c
@@ -1587,6 +1587,13 @@ lbm_msgno_filt_check(LibBalsaMailboxMsgnoFiltCheckInfo * info)
     gboolean match;
     GNode *node;
 
+    if (!MAILBOX_OPEN(mailbox)) {
+        g_object_unref(mailbox);
+        libbalsa_mailbox_search_iter_unref(search_iter);
+        g_free(info);
+        return FALSE;
+    }
+
     match = search_iter ?
         libbalsa_mailbox_message_match(mailbox, seqno, search_iter) : TRUE;
     node = g_node_find(mailbox->msg_tree, G_PRE_ORDER, G_TRAVERSE_ALL,