[mutter] Don't use gtk_settings callback to set shell_shows_app_menu

[Jonas Ådahl <jadahl src gnome org>]

commit de5e7a717554d12aff944608b018ae9d2bddd2c0
Author: Armin Krezović <krezovic armin gmail com>
Date:   Sat Aug 26 22:43:57 2017 +0200

    Don't use gtk_settings callback to set shell_shows_app_menu
    
    GTK+ won't be initialized if X11 is not available
    
    Instead, when setting gtk-shell-shows-app-menu,
    meta_prefs_set_show_fallback_app_menu should be
    called as well.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759538

 src/core/prefs.c | 43 +++++++++++++------------------------------
 src/meta/prefs.h |  2 ++
 2 files changed, 15 insertions(+), 30 deletions(-)
---
diff --git a/src/core/prefs.c b/src/core/prefs.c
index bad54cbf2..2f96e5633 100644
--- a/src/core/prefs.c
+++ b/src/core/prefs.c
@@ -137,10 +137,6 @@ static void bindings_changed (GSettings      *settings,
                               gchar          *key,
                               gpointer        data);
 
-static void shell_shows_app_menu_changed (GtkSettings *settings,
-                                          GParamSpec  *pspec,
-                                          gpointer     data);
-
 static void update_cursor_size_from_gtk (GtkSettings *settings,
                                          GParamSpec *pspec,
                                          gpointer data);
@@ -974,10 +970,6 @@ meta_prefs_init (void)
                       G_CALLBACK (wayland_settings_changed), NULL);
   g_hash_table_insert (settings_schemas, g_strdup (SCHEMA_INTERFACE), settings);
 
-  g_signal_connect (gtk_settings_get_default (),
-                    "notify::gtk-shell-shows-app-menu",
-                    G_CALLBACK (shell_shows_app_menu_changed), NULL);
-
   if (!meta_is_wayland_compositor ())
     g_signal_connect (gtk_settings_get_default (), "notify::gtk-cursor-theme-size",
                       G_CALLBACK (update_cursor_size_from_gtk), NULL);
@@ -1003,7 +995,6 @@ meta_prefs_init (void)
   handle_preference_init_int ();
 
   update_cursor_size ();
-  shell_shows_app_menu_changed (gtk_settings_get_default (), NULL, NULL);
 
   init_bindings ();
 }
@@ -1218,27 +1209,6 @@ bindings_changed (GSettings *settings,
   g_strfreev (strokes);
 }
 
-static void
-shell_shows_app_menu_changed (GtkSettings *settings,
-                              GParamSpec *pspec,
-                              gpointer data)
-{
-  int shell_shows_app_menu = 1;
-  gboolean changed = FALSE;
-
-  g_object_get (settings,
-                "gtk-shell-shows-app-menu", &shell_shows_app_menu,
-                NULL);
-
-
-  changed = (show_fallback_app_menu == !!shell_shows_app_menu);
-
-  show_fallback_app_menu = !shell_shows_app_menu;
-
-  if (changed)
-    queue_changed (META_PREF_BUTTON_LAYOUT);
-}
-
 static void
 update_cursor_size (void)
 {
@@ -1343,6 +1313,19 @@ meta_prefs_get_show_fallback_app_menu (void)
   return show_fallback_app_menu;
 }
 
+void
+meta_prefs_set_show_fallback_app_menu (gboolean whether)
+{
+  gboolean changed = FALSE;
+
+  changed = (show_fallback_app_menu == !whether);
+
+  show_fallback_app_menu = whether;
+
+  if (changed)
+    queue_changed (META_PREF_BUTTON_LAYOUT);
+}
+
 const char*
 meta_prefs_get_cursor_theme (void)
 {
diff --git a/src/meta/prefs.h b/src/meta/prefs.h
index 378ef5d4f..b2618af48 100644
--- a/src/meta/prefs.h
+++ b/src/meta/prefs.h
@@ -140,7 +140,9 @@ gboolean                    meta_prefs_get_gnome_animations   (void);
 gboolean                    meta_prefs_get_edge_tiling        (void);
 gboolean                    meta_prefs_get_auto_maximize      (void);
 gboolean                    meta_prefs_get_center_new_windows (void);
+
 gboolean                    meta_prefs_get_show_fallback_app_menu (void);
+void                        meta_prefs_set_show_fallback_app_menu (gboolean whether);
 
 void                        meta_prefs_get_button_layout (MetaButtonLayout *button_layout);