[gtk/gtk-demo-fixes: 4/9] gtk-demo: Fix a crash in the font explorer demo

[Matthias Clasen <matthiasc src gnome org>]

commit db42c23c0a90b72c421dc75d31789aa425175982
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 23 22:33:02 2019 -0500

    gtk-demo: Fix a crash in the font explorer demo
    
    gtk_widget_add_controller is transfer-full.

 demos/gtk-demo/font_features.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/font_features.c b/demos/gtk-demo/font_features.c
index 1fc8e92d69..dbd22e0663 100644
--- a/demos/gtk-demo/font_features.c
+++ b/demos/gtk-demo/font_features.c
@@ -1228,7 +1228,7 @@ do_font_features (GtkWidget *do_widget)
       edit_toggle = GTK_WIDGET (gtk_builder_get_object (builder, "edit_toggle"));
 
       controller = gtk_event_controller_key_new ();
-      g_object_set_data_full (G_OBJECT (entry), "controller", controller, g_object_unref);
+      g_object_set_data_full (G_OBJECT (entry), "controller", g_object_ref (controller), g_object_unref);
       g_signal_connect (controller, "key-pressed", G_CALLBACK (entry_key_press), entry);
       gtk_widget_add_controller (entry, controller);