[atomix] Use fallback mode to show appmenu (Refs #7)

[Robert Roth <robertroth src gnome org>]

commit 2fcd6a801bee739fb61d36fa18e001f421771dfb
Author: Robert Roth <robert roth off gmail com>
Date:   Sun Mar 25 06:20:52 2018 +0300

    Use fallback mode to show appmenu (Refs #7)

 data/ui/interface.ui | 1 +
 src/main.c           | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/data/ui/interface.ui b/data/ui/interface.ui
index ea251c0..5d27520 100644
--- a/data/ui/interface.ui
+++ b/data/ui/interface.ui
@@ -241,6 +241,7 @@
         <property name="can_focus">False</property>
         <property name="title">Atomix</property>
         <property name="show_close_button">True</property>
+        <property name="decoration_layout">menu:close</property>
         <child>
           <placeholder/>
         </child>
diff --git a/src/main.c b/src/main.c
index a041e2b..65c57a4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -615,7 +615,10 @@ static AtomixApp *create_gui (GApplication *app_instance)
   GMenu * menu = G_MENU (gtk_builder_get_object (builder, "appmenu"));
   gtk_application_set_app_menu (GTK_APPLICATION (app->app_instance), G_MENU_MODEL (menu));
 
-
+  // TODO find out why appmenu isn't shown without this
+  g_object_set (gtk_widget_get_settings (headerbar),
+                "gtk-shell-shows-app-menu", FALSE,
+                NULL);
 
   g_object_unref (builder);