[gtk/macos-ci: 1777/1778] gtk-demo: Use a scope for callbacks

[Matthias Clasen <matthiasc src gnome org>]

commit 725edc648590ababa11c6708e75fa4bc4262dd73
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 5 08:16:29 2021 -0400

    gtk-demo: Use a scope for callbacks
    
    This should fix the demo not working on some Windows
    builds.

 demos/gtk-demo/font_features.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/font_features.c b/demos/gtk-demo/font_features.c
index c8f9ebf62a..8f5754a412 100644
--- a/demos/gtk-demo/font_features.c
+++ b/demos/gtk-demo/font_features.c
@@ -1236,11 +1236,17 @@ do_font_features (GtkWidget *do_widget)
 
   if (!window)
     {
+      GtkBuilderScope *scope;
       GtkBuilder *builder;
       GtkWidget *feature_list;
       GtkEventController *controller;
 
-      builder = gtk_builder_new_from_resource ("/font_features/font-features.ui");
+      scope = gtk_builder_cscope_new ();
+      gtk_builder_cscope_add_callback_symbol (GTK_BUILDER_CSCOPE (scope),
+                                              "font_features_reset_features", font_features_reset_features);
+      builder = gtk_builder_new ();
+      gtk_builder_set_scope (builder, scope);
+      gtk_builder_add_from_resource (builder, "/font_features/font-features.ui", NULL);
 
       window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
       feature_list = GTK_WIDGET (gtk_builder_get_object (builder, "feature_list"));