tests/clutter/conform: Add a test for event delivery

Add a test for everything related to event delivery. The first test we
add here is making sure we don't regress on the bug fixed with commit
edc226a04d.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2697>

src/tests/clutter/conform/event-delivery.c

@@ -0,0 +1,69 @@
+#include <clutter/clutter.h>
+
+#include "tests/clutter-test-utils.h"
+
+static void
+on_after_update (ClutterStage     *stage,
+                 ClutterStageView *view,
+                 gboolean         *was_updated)
+{
+  *was_updated = TRUE;
+}
+
+static gboolean
+on_event_return_stop (ClutterActor *actor,
+                      ClutterEvent *event,
+                      unsigned int *n_events)
+{
+  (*n_events)++;
+
+  return CLUTTER_EVENT_STOP;
+}
+
+static void
+wait_stage_updated (gboolean *was_updated)
+{
+  *was_updated = FALSE;
+  while (!*was_updated)
+    g_main_context_iteration (NULL, TRUE);
+}
+
+static void
+event_delivery_consecutive_touch_begin_end (void)
+{
+  ClutterActor *stage = clutter_test_get_stage ();
+  ClutterSeat *seat = clutter_backend_get_default_seat (clutter_get_default_backend ());
+  g_autoptr (ClutterVirtualInputDevice) virtual_pointer = NULL;
+  int64_t now_us;
+  gboolean was_updated;
+  unsigned int n_captured_touch_events = 0;
+
+  virtual_pointer = clutter_seat_create_virtual_device (seat, CLUTTER_POINTER_DEVICE);
+  now_us = g_get_monotonic_time ();
+
+  g_signal_connect (stage, "after-update", G_CALLBACK (on_after_update),
+                    &was_updated);
+  g_signal_connect (stage, "captured-event::touch", G_CALLBACK (on_event_return_stop),
+                    &n_captured_touch_events);
+
+  clutter_actor_show (stage);
+
+  was_updated = FALSE;
+  clutter_virtual_input_device_notify_touch_down (virtual_pointer, now_us, 0, 5, 5);
+  clutter_virtual_input_device_notify_touch_up (virtual_pointer, now_us, 0);
+  clutter_virtual_input_device_notify_touch_down (virtual_pointer, now_us, 0, 5, 5);
+  g_assert_true (!was_updated);
+  wait_stage_updated (&was_updated);
+  g_assert_cmpint (n_captured_touch_events, ==, 3);
+
+  clutter_virtual_input_device_notify_touch_up (virtual_pointer, now_us, 0);
+  wait_stage_updated (&was_updated);
+  g_assert_cmpint (n_captured_touch_events, ==, 4);
+
+  g_signal_handlers_disconnect_by_func (stage, on_event_return_stop, &n_captured_touch_events);
+  g_signal_handlers_disconnect_by_func (stage, on_after_update, &was_updated);
+}
+
+CLUTTER_TEST_SUITE (
+  CLUTTER_TEST_UNIT ("/event/delivery/consecutive-touch-begin-end", event_delivery_consecutive_touch_begin_end);
+)

src/tests/clutter/conform/meson.build

@@ -34,6 +34,7 @@ clutter_conform_tests_classes_tests = [
 clutter_conform_tests_general_tests = [
   'binding-pool',
   'color',
+  'event-delivery',
   'frame-clock',
   'frame-clock-timeline',
   'grab',