[gtk/wip/baedert/for-master] shortcutcontroller: Save signal handler ID

[Timm Bäder <baedert src gnome org>]

commit 138b5945d57a74feb2dd15233d656cc6b42cb440
Author: Timm Bäder <mail baedert org>
Date:   Thu Nov 19 15:27:25 2020 +0100

    shortcutcontroller: Save signal handler ID
    
    gtk_shortcut_controller_finalize() used to take ~13.8% when closing the
    complex listbox demo in gtk4-demo. Now it takes nothing.

 gtk/gtkshortcutcontroller.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkshortcutcontroller.c b/gtk/gtkshortcutcontroller.c
index e30a82ab98..3d63bbfdf3 100644
--- a/gtk/gtkshortcutcontroller.c
+++ b/gtk/gtkshortcutcontroller.c
@@ -91,6 +91,7 @@ struct _GtkShortcutController
   GtkShortcutScope scope;
   GdkModifierType mnemonics_modifiers;
 
+  gulong shortcuts_changed_id;
   guint custom_shortcuts : 1;
 
   guint last_activated;
@@ -213,7 +214,11 @@ gtk_shortcut_controller_set_property (GObject      *object,
             self->shortcuts = g_object_ref (model);
             self->custom_shortcuts = FALSE;
           }
-        g_signal_connect_swapped (self->shortcuts, "items-changed", G_CALLBACK (g_list_model_items_changed), 
self);
+
+        self->shortcuts_changed_id =  g_signal_connect_swapped (self->shortcuts,
+                                                                "items-changed",
+                                                                G_CALLBACK (g_list_model_items_changed),
+                                                                self);
       }
       break;
 
@@ -265,7 +270,7 @@ gtk_shortcut_controller_finalize (GObject *object)
 {
   GtkShortcutController *self = GTK_SHORTCUT_CONTROLLER (object);
 
-  g_signal_handlers_disconnect_by_func (self->shortcuts, g_list_model_items_changed, self);
+  g_clear_signal_handler (&self->shortcuts_changed_id, self->shortcuts);
   g_clear_object (&self->shortcuts);
 
   G_OBJECT_CLASS (gtk_shortcut_controller_parent_class)->finalize (object);