[balsa/gtk3] Survive torture test

[Peter Bloomfield <PeterB src gnome org>]

commit e31913755d257a9012d981aab1ae4e0c9d0b700a
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Thu Feb 28 18:30:51 2013 -0500

    Survive torture test
    
        * src/main-window.c: survive torture test.

 ChangeLog         |    4 ++++
 src/main-window.c |   27 +++++++++++++++++++++------
 2 files changed, 25 insertions(+), 6 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index b584ba9..4d0cb1f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2013-02-28  Peter Bloomfield
 
+       * src/main-window.c: survive torture test.
+
+2013-02-28  Peter Bloomfield
+
        * libbalsa/mailbox.c (lbm_msgno_filt_check),
        (lbm_msgno_filt_check_idle_cb),
        (libbalsa_mailbox_msgno_filt_check): check message against view
diff --git a/src/main-window.c b/src/main-window.c
index 4474dbc..9784b2b 100644
--- a/src/main-window.c
+++ b/src/main-window.c
@@ -2346,11 +2346,15 @@ bw_real_open_mbnode_idle_cb(BalsaWindowRealOpenMbnodeInfo * info)
     GtkWidget        *scroll;
     gint              page_num;
 
-    if (window) {
-        balsa_window_decrease_activity(window, info->message);
-        g_object_remove_weak_pointer(G_OBJECT(window),
-                                     (gpointer) &info->window);
+    if (!window) {
+        g_free(info->message);
+        g_free(info);
+        return FALSE;
     }
+
+    balsa_window_decrease_activity(window, info->message);
+    g_object_remove_weak_pointer(G_OBJECT(window),
+                                 (gpointer) &info->window);
     g_free(info->message);
 
     if (balsa_find_notebook_page_num(mailbox) >= 0) {
@@ -2931,6 +2935,9 @@ check_new_messages_real(BalsaWindow * window, int type)
     struct check_messages_thread_info *info;
 #endif
 
+    if (window && !BALSA_IS_WINDOW(window))
+        return;
+
     list = NULL;
 #if defined(BALSA_USE_THREADS)
     /*  Only Run once -- If already checking mail, return.  */
@@ -2983,6 +2990,8 @@ check_new_messages_real(BalsaWindow * window, int type)
 
     bw_check_mailbox_list(window, balsa_app.inbox_input);
 
+    if (!balsa_app.mblist_tree_store)
+        return;
     gtk_tree_model_foreach(GTK_TREE_MODEL(balsa_app.mblist_tree_store),
                           (GtkTreeModelForeachFunc) bw_add_mbox_to_checklist,
                           &list);
@@ -3675,11 +3684,17 @@ bw_nm_client_state_changed_cb(GObject * gobject, GParamSpec * pspec,
                               gpointer data)
 {
     NMClient *client = NM_CLIENT(gobject);
-    BalsaWindow *window = BALSA_WINDOW(data);
+    BalsaWindow *window;
     NMState new_state = nm_client_get_state(client);
-    NMState old_state = window->nm_state;
+    NMState old_state;
     gboolean is_connected;
 
+    if (!BALSA_IS_WINDOW(data))
+        return;
+
+    window = BALSA_WINDOW(data);
+    old_state = window->nm_state;
+
     if (new_state == old_state) {
         /* Notify signal does not guarantee that anything really
          * changed. */