[balsa/wip/gtk4: 259/351] mailbox: Do not use our own parent_class

[Peter Bloomfield <peterb src gnome org>]

commit a1bcb3ecc1cea31adac45ede99045f040ba42a4b
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon Mar 26 15:39:49 2018 -0400

    mailbox: Do not use our own parent_class
    
    instead of the one generated by G_DEFINE_TYPE...
    
    Also use g_clear_pointer on mailbox->mindex.

 libbalsa/mailbox.c |   12 +++---------
 1 files changed, 3 insertions(+), 9 deletions(-)
---
diff --git a/libbalsa/mailbox.c b/libbalsa/mailbox.c
index c8911aa..abd592d 100644
--- a/libbalsa/mailbox.c
+++ b/libbalsa/mailbox.c
@@ -91,7 +91,6 @@ enum {
     LAST_MODEL_SIGNAL
 };
 
-static GObjectClass *parent_class = NULL;
 static guint libbalsa_mailbox_signals[LAST_SIGNAL];
 static guint libbalsa_mbox_model_signals[LAST_MODEL_SIGNAL];
 
@@ -181,8 +180,6 @@ libbalsa_mailbox_class_init(LibBalsaMailboxClass *klass)
 {
     GObjectClass *object_class = G_OBJECT_CLASS(klass);
 
-    parent_class = g_type_class_peek_parent(klass);
-
     /* This signal is emitted by the mailbox when new messages are
        retrieved (check mail or opening of the mailbox). This is used
        by GUI to sync on the mailbox content (see BalsaIndex)
@@ -324,7 +321,7 @@ libbalsa_mailbox_dispose(GObject *object)
     libbalsa_clear_source_id(&priv->queue_check_idle_id);
     libbalsa_clear_source_id(&priv->need_threading_idle_id);
 
-    G_OBJECT_CLASS(parent_class)->dispose(object);
+    G_OBJECT_CLASS(libbalsa_mailbox_parent_class)->dispose(object);
 }
 
 
@@ -511,7 +508,7 @@ libbalsa_mailbox_finalize(GObject *object)
 
     libbalsa_mailbox_view_free(priv->view);
 
-    G_OBJECT_CLASS(parent_class)->finalize(object);
+    G_OBJECT_CLASS(libbalsa_mailbox_parent_class)->finalize(object);
 }
 
 
@@ -685,10 +682,7 @@ libbalsa_mailbox_close(LibBalsaMailbox *mailbox,
         /* do not try expunging read-only mailboxes, it's a waste of time */
         expunge = expunge && !priv->readonly;
         LIBBALSA_MAILBOX_GET_CLASS(mailbox)->close_mailbox(mailbox, expunge);
-        if (priv->msg_tree) {
-            g_node_destroy(priv->msg_tree);
-            priv->msg_tree = NULL;
-        }
+        g_clear_pointer(&priv->msg_tree, (GDestroyNotify) g_node_destroy);
         libbalsa_mailbox_free_mindex(mailbox);
         priv->stamp++;
         priv->state = LB_MAILBOX_STATE_CLOSED;