[devhelp] Window: set sidebar and notebook to NULL in dispose()

[Sébastien Wilmet <swilmet src gnome org>]

commit 952b0e16b5aa2105e4e9a4df18307da2610257d3
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun May 27 10:14:02 2018 +0200

    Window: set sidebar and notebook to NULL in dispose()
    
    Those widgets are added to their containers and DhWindow doesn't keep
    explicitly a reference, so when the container is destroyed so is the
    widget.
    
    In the unlikely event when a DhWindow function is called after
    dispose(), this will prevent ugly crashes (just in case).

 src/dh-window.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/src/dh-window.c b/src/dh-window.c
index 4ccdd391..c3c4c964 100644
--- a/src/dh-window.c
+++ b/src/dh-window.c
@@ -73,13 +73,27 @@ dh_window_delete_event (GtkWidget   *widget,
         return GTK_WIDGET_CLASS (dh_window_parent_class)->delete_event (widget, event);
 }
 
+static void
+dh_window_dispose (GObject *object)
+{
+        DhWindowPrivate *priv = dh_window_get_instance_private (DH_WINDOW (object));
+
+        priv->sidebar = NULL;
+        priv->notebook = NULL;
+
+        G_OBJECT_CLASS (dh_window_parent_class)->dispose (object);
+}
+
 static void
 dh_window_class_init (DhWindowClass *klass)
 {
         GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+        GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
         widget_class->delete_event = dh_window_delete_event;
 
+        object_class->dispose = dh_window_dispose;
+
         /* Bind class to template */
         gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/devhelp/dh-window.ui");
         gtk_widget_class_bind_template_child_private (widget_class, DhWindow, header_bar);