appchooserdialog: use new GLib API to modify positioning

The dialog will always show up with the last selected application.

configure.ac

@@ -38,7 +38,7 @@ AC_CONFIG_MACRO_DIR([m4])
 m4_define([gtk_binary_version], [3.0.0])
 
 # required versions of other packages
-m4_define([glib_required_version], [2.27.3])
+m4_define([glib_required_version], [2.27.5])
 m4_define([pango_required_version], [1.20])
 m4_define([atk_required_version], [1.29.2])
 m4_define([cairo_required_version], [1.10.0])

gtk/gtkappchooserdialog.c

@@ -234,9 +234,9 @@ add_or_find_application (GtkAppChooserDialog *self)
   app = gtk_app_chooser_get_app_info (GTK_APP_CHOOSER (self));
 
   /* we don't care about reporting errors here */
-  g_app_info_add_supports_type (app,
-                                self->priv->content_type,
-                                NULL);
+  g_app_info_set_as_last_used_for_type (app,
+                                        self->priv->content_type,
+                                        NULL);
 
   g_object_unref (app);
 }