cleanup: Use g_clear_signal_handler() where possible

`g_clear_signal_handler()` is usually cleaner and saver than
`g_signal_handler_disconnect()`. We use it new code, lets also
adopt the existing one.

See also https://gitlab.gnome.org/GNOME/mutter/merge_requests/868
and https://gitlab.gnome.org/GNOME/mutter/merge_requests/940

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/842

src/calendar-server/calendar-sources.c

@@ -112,7 +112,7 @@ static CalendarSources *calendar_sources_singleton = NULL;
 static void
 client_data_free (ClientData *data)
 {
-  g_signal_handler_disconnect (data->client, data->backend_died_id);
+  g_clear_signal_handler (&data->backend_died_id, data->client);
   g_object_unref (data->client);
   g_slice_free (ClientData, data);
 }
@@ -259,12 +259,12 @@ calendar_sources_finalize (GObject *object)
 
   if (sources->priv->registry)
     {
-      g_signal_handler_disconnect (sources->priv->registry,
+      g_clear_signal_handler (&sources->priv->source_added_id,
-                                   sources->priv->source_added_id);
+                              sources->priv->registry);
-      g_signal_handler_disconnect (sources->priv->registry,
+      g_clear_signal_handler (&sources->priv->source_changed_id,
-                                   sources->priv->source_changed_id);
+                              sources->priv->registry);
-      g_signal_handler_disconnect (sources->priv->registry,
+      g_clear_signal_handler (&sources->priv->source_removed_id,
-                                   sources->priv->source_removed_id);
+                              sources->priv->registry);
       g_object_unref (sources->priv->registry);
     }
   sources->priv->registry = NULL;

src/calendar-server/gnome-shell-calendar-server.c

@@ -789,8 +789,7 @@ app_free (App *app)
   g_hash_table_unref (app->appointments);
 
   g_object_unref (app->connection);
-  g_signal_handler_disconnect (app->sources,
+  g_clear_signal_handler (&app->sources_signal_id, app->sources);
-                               app->sources_signal_id);
   g_object_unref (app->sources);
 
   if (app->changed_timeout_id != 0)

src/gtkactionmuxer.c

@@ -540,7 +540,7 @@ gtk_action_muxer_free_group (gpointer data)
 
   /* 'for loop' or 'four loop'? */
   for (i = 0; i < 4; i++)
-    g_signal_handler_disconnect (group->group, group->handler_ids[i]);
+    g_clear_signal_handler (&group->handler_ids[i], group->group);
 
   g_object_unref (group->group);
   g_free (group->prefix);

src/shell-app.c

@@ -35,7 +35,7 @@ typedef struct {
   guint refcount;
 
   /* Signal connection to dirty window sort list on workspace changes */
-  guint workspace_switch_id;
+  gulong workspace_switch_id;
 
   GSList *windows;
 
@@ -1445,7 +1445,7 @@ unref_running_state (ShellAppRunningState *state)
   if (state->refcount > 0)
     return;
 
-  g_signal_handler_disconnect (workspace_manager, state->workspace_switch_id);
+  g_clear_signal_handler (&state->workspace_switch_id, workspace_manager);
 
   g_clear_object (&state->application_proxy);
 

src/shell-gtk-embed.c

@@ -23,9 +23,9 @@ struct _ShellGtkEmbedPrivate
   ShellEmbeddedWindow *window;
 
   ClutterActor *window_actor;
-  guint window_actor_destroyed_handler;
+  gulong window_actor_destroyed_handler;
 
-  guint window_created_handler;
+  gulong window_created_handler;
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (ShellGtkEmbed, shell_gtk_embed, CLUTTER_TYPE_CLONE);
@@ -47,9 +47,8 @@ shell_gtk_embed_remove_window_actor (ShellGtkEmbed *embed)
 
   if (priv->window_actor)
     {
-      g_signal_handler_disconnect (priv->window_actor,
+      g_clear_signal_handler (&priv->window_actor_destroyed_handler,
-                                   priv->window_actor_destroyed_handler);
+                              priv->window_actor);
-      priv->window_actor_destroyed_handler = 0;
 
       g_object_unref (priv->window_actor);
       priv->window_actor = NULL;
@@ -116,9 +115,8 @@ shell_gtk_embed_window_created_cb (MetaDisplay   *display,
 
       /* Now that we've found the window we don't need to listen for
          new windows anymore */
-      g_signal_handler_disconnect (display,
+      g_clear_signal_handler (&priv->window_created_handler,
-                                   priv->window_created_handler);
+                              display);
-      priv->window_created_handler = 0;
     }
 }
 
@@ -148,12 +146,7 @@ shell_gtk_embed_set_window (ShellGtkEmbed       *embed,
 
   if (priv->window)
     {
-      if (priv->window_created_handler)
+      g_clear_signal_handler (&priv->window_created_handler, display);
-        {
-          g_signal_handler_disconnect (display,
-                                       priv->window_created_handler);
-          priv->window_created_handler = 0;
-        }
 
       shell_gtk_embed_remove_window_actor (embed);
 

src/st/st-adjustment.c

@@ -623,7 +623,7 @@ transition_closure_free (gpointer data)
   clos = data;
   timeline = CLUTTER_TIMELINE (clos->transition);
 
-  g_signal_handler_disconnect (clos->transition, clos->completed_id);
+  g_clear_signal_handler (&clos->completed_id, clos->transition);
 
   if (clutter_timeline_is_playing (timeline))
     clutter_timeline_stop (timeline);

src/st/st-icon.c

@@ -50,7 +50,7 @@ struct _StIconPrivate
 {
   ClutterActor    *icon_texture;
   ClutterActor    *pending_texture;
-  guint            opacity_handler_id;
+  gulong           opacity_handler_id;
 
   GIcon           *gicon;
   gint             prop_icon_size;  /* icon size set as property */
@@ -369,8 +369,7 @@ opacity_changed_cb (GObject *object,
   StIcon *icon = user_data;
   StIconPrivate *priv = icon->priv;
 
-  g_signal_handler_disconnect (priv->pending_texture, priv->opacity_handler_id);
+  g_clear_signal_handler (&priv->opacity_handler_id, priv->pending_texture);
-  priv->opacity_handler_id = 0;
 
   st_icon_finish_update (icon);
 }

src/st/st-texture-cache.c

@@ -707,7 +707,7 @@ typedef struct {
   ClutterActor *actor;
   gint size;
   GObject *source;
-  guint notify_signal_id;
+  gulong notify_signal_id;
   gboolean weakref_active;
 } StTextureCachePropertyBind;
 
@@ -772,7 +772,7 @@ st_texture_cache_bind_weak_notify (gpointer     data,
 {
   StTextureCachePropertyBind *bind = data;
   bind->weakref_active = FALSE;
-  g_signal_handler_disconnect (bind->source, bind->notify_signal_id);
+  g_clear_signal_handler (&bind->notify_signal_id, bind->source);
 }
 
 static void

src/st/st-theme-node-transition.c

@@ -54,8 +54,8 @@ struct _StThemeNodeTransitionPrivate {
 
   ClutterTimeline *timeline;
 
-  guint timeline_completed_id;
+  gulong timeline_completed_id;
-  guint timeline_new_frame_id;
+  gulong timeline_new_frame_id;
 
   ClutterActorBox last_allocation;
   ClutterActorBox offscreen_box;
@@ -410,12 +410,8 @@ st_theme_node_transition_dispose (GObject *object)
 
   if (priv->timeline)
     {
-      if (priv->timeline_completed_id != 0)
+      g_clear_signal_handler (&priv->timeline_completed_id, priv->timeline);
-        g_signal_handler_disconnect (priv->timeline,
+      g_clear_signal_handler (&priv->timeline_new_frame_id, priv->timeline);
-                                     priv->timeline_completed_id);
-      if (priv->timeline_new_frame_id != 0)
-        g_signal_handler_disconnect (priv->timeline,
-                                     priv->timeline_new_frame_id);
 
       g_clear_object (&priv->timeline);
     }

src/st/st-widget.c

@@ -308,11 +308,8 @@ st_widget_dispose (GObject *gobject)
 
   g_clear_pointer (&priv->label_actor, g_object_unref);
 
-  if (priv->texture_file_changed_id != 0)
+  g_clear_signal_handler (&priv->texture_file_changed_id,
-    {
+                          st_texture_cache_get_default ());
-      g_signal_handler_disconnect (st_texture_cache_get_default (), priv->texture_file_changed_id);
-      priv->texture_file_changed_id = 0;
-    }
 
   g_clear_object (&priv->first_visible_child);
   g_clear_object (&priv->last_visible_child);