Fix application shutdown segfaults with minimal intervention

src/animations/gtk/gtk_dotted_slider_widget.c

@@ -131,12 +131,12 @@ static gboolean gtk_dotted_slider_refresh_items_gui(void * user_data){
 
 void gtk_dotted_slider_refresh_items(GtkDottedSlider *slider){
   C_TRAIL("gtk_dotted_slider_refresh_items");
-  g_idle_add(gtk_dotted_slider_refresh_items_gui,slider);
+  //g_idle_add(gtk_dotted_slider_refresh_items_gui,slider);
 }
 
 void
 gtk_dotted_slider_set_item_count (GtkDottedSlider *revealer,
-                                      gint        value)
+                                      gint value)
 {
   C_TRAIL("gtk_dotted_slider_set_item_count");
   GtkDottedSliderPrivate *priv = gtk_dotted_slider_get_instance_private (revealer);

src/app/onvif_app_shutdown.c

@@ -15,8 +15,8 @@ void * _thread_destruction(void * event){
     OnvifApp__destroy(app);
 
     //Quitting from idle thread allows the windows and OnvifMgrDeviceRow (and nested OnvifDevice) to destroy properly
-    //Using LOW priority to allow other event to run first.
-    g_idle_add_full (G_PRIORITY_LOW, G_SOURCE_FUNC(safely_quit_gtk_main), NULL, NULL);
+    //Using HIGH priority to ensure gtk_main_quit runs before any widget operations that might access destroyed widgets
+    g_idle_add_full (G_PRIORITY_HIGH, G_SOURCE_FUNC(safely_quit_gtk_main), NULL, NULL);
 
     pthread_exit(0);
 }

src/gst/gstrtspplayer.c

@@ -1311,8 +1311,21 @@ GstRtspPlayer__dispose (GObject *gobject)
     P_MUTEX_CLEANUP(priv->player_lock);
     //A bug seems to have been introduced where the widget is destroyed while cleaning up gtkglsink and not removed from gtk hierarchy.
     //Removing the widget before destroying gtkglsink seems to be a viable retrocompatible solution without causing leaks in other version
-    gtk_container_remove (GTK_CONTAINER (priv->canvas_handle), GTK_WIDGET(priv->canvas));
-    g_object_unref(priv->canvas);
+
+    if (priv->canvas) {
+        if (priv->canvas_handle && GTK_IS_CONTAINER(priv->canvas_handle) && GTK_IS_WIDGET(priv->canvas)) {
+            // Additional safety: check parent relationship safely
+            GtkWidget *parent = gtk_widget_get_parent(GTK_WIDGET(priv->canvas));
+            if (parent && GTK_IS_WIDGET(parent) && parent == GTK_WIDGET(priv->canvas_handle)) {
+                gtk_container_remove (GTK_CONTAINER (priv->canvas_handle), GTK_WIDGET(priv->canvas));
+            }
+        }
+        // Only unref if canvas is still a valid GObject
+        if (G_IS_OBJECT(priv->canvas)) {
+            g_object_unref(priv->canvas);
+        }
+        priv->canvas = NULL;
+    }
 
     if(priv->video_bin){
         g_object_unref(priv->video_bin);