tests/conform: Use the clutter stage from mutter

The tests created their own stage, which caused various issues. Lets use
the one from mutter instead.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1289

src/tests/clutter-test-utils.c

@@ -5,8 +5,6 @@
 #include <clutter/clutter.h>
 
 typedef struct {
-  ClutterActor *stage;
-
   guint no_display : 1;
 } ClutterTestEnvironment;
 
@@ -98,18 +96,9 @@ out:
 ClutterActor *
 clutter_test_get_stage (void)
 {
-  g_assert (test_environ != NULL);
+  MetaBackend *backend = meta_get_backend ();
 
-  if (test_environ->stage == NULL)
-    {
-      /* create a stage, and ensure that it goes away at the end */
-      test_environ->stage = clutter_stage_new ();
-      clutter_actor_set_name (test_environ->stage, "Test Stage");
-      g_object_add_weak_pointer (G_OBJECT (test_environ->stage),
-                                 (gpointer *) &test_environ->stage);
-    }
-
-  return test_environ->stage;
+  return meta_backend_get_stage (backend);
 }
 
 typedef struct {
@@ -122,11 +111,13 @@ static void
 clutter_test_func_wrapper (gconstpointer data_)
 {
   const ClutterTestData *data = data_;
+  ClutterActor *stage;
 
   g_test_log_set_fatal_handler (log_func, NULL);
 
   /* ensure that the previous test state has been cleaned up */
-  g_assert_null (test_environ->stage);
+  stage = clutter_test_get_stage ();
+  g_assert_false (clutter_actor_is_mapped (stage));
 
   if (test_environ->no_display)
     {
@@ -151,11 +142,8 @@ out:
   if (data->test_notify != NULL)
     data->test_notify (data->test_data);
 
-  if (test_environ->stage != NULL)
-    {
-      clutter_actor_destroy (test_environ->stage);
-      g_assert_null (test_environ->stage);
-    }
+  clutter_actor_remove_all_children (stage);
+  clutter_actor_hide (stage);
 }
 
 /**

src/tests/clutter/conform/actor-shader-effect.c

@@ -260,7 +260,7 @@ actor_shader_effect (void)
   if (!clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
     return;
 
-  stage = clutter_stage_new ();
+  stage = clutter_test_get_stage ();
 
   rect = make_actor (foo_old_shader_effect_get_type ());
   clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);

src/tests/clutter/conform/timeline-interpolate.c

@@ -132,8 +132,11 @@ completed_cb (ClutterTimeline *timeline,
 static void
 timeline_interpolation (void)
 {
+  ClutterActor *stage;
   TestState state;
 
+  stage = clutter_test_get_stage ();
+
   state.timeline = 
     clutter_timeline_new (TEST_TIMELINE_DURATION);
   clutter_timeline_set_repeat_count (state.timeline, -1);
@@ -151,6 +154,8 @@ timeline_interpolation (void)
   state.passed = TRUE;
   state.expected_frame = 0;
 
+  clutter_actor_show (stage);
+
   state.start_time = g_get_real_time ();
   clutter_timeline_start (state.timeline);
   

src/tests/clutter/conform/timeline-rewind.c

@@ -70,8 +70,11 @@ new_frame_cb (ClutterTimeline *timeline,
 static void
 timeline_rewind (void)
 {
+  ClutterActor *stage;
   TestState state;
 
+  stage = clutter_test_get_stage ();
+
   state.timeline = 
     clutter_timeline_new (TEST_TIMELINE_DURATION);
   g_signal_connect (G_OBJECT(state.timeline),
@@ -85,6 +88,8 @@ timeline_rewind (void)
                                &state);
   state.rewind_count = 0;
 
+  clutter_actor_show (stage);
+
   clutter_timeline_start (state.timeline);
   
   clutter_main();

src/tests/clutter/conform/timeline.c

@@ -184,6 +184,7 @@ delay_cb (gpointer data)
 static void
 timeline_base (void)
 {
+  ClutterActor *stage;
   ClutterTimeline *timeline_1;
   TimelineData data_1;
   ClutterTimeline *timeline_2;
@@ -194,6 +195,8 @@ timeline_base (void)
   gsize n_markers;
   guint delay_tag;
 
+  stage = clutter_test_get_stage ();
+
   timeline_data_init (&data_1, 1);
   timeline_1 = clutter_timeline_new (FRAME_COUNT * 1000 / FPS);
   clutter_timeline_add_marker_at_time (timeline_1, "start-marker",
@@ -263,6 +266,8 @@ timeline_base (void)
                     "completed", G_CALLBACK (timeline_complete_cb),
                     &data_3);
 
+  clutter_actor_show (stage);
+
   if (!g_test_quiet ())
     g_print ("Without delay...\n");