1 files changed, 58 insertions, 13 deletions

diff --git a/src/backends/x11/meta-backend-x11.c b/src/backends/x11/meta-backend-x11.c
index f01fa9ffd..8e95a5a5d 100644
--- a/src/backends/x11/meta-backend-x11.c
+++ b/src/backends/x11/meta-backend-x11.c
@@ -60,6 +60,10 @@ struct _MetaBackendX11Private
   XSyncAlarm user_active_alarm;
   XSyncCounter counter;
 
+  int current_touch_replay_sync_serial;
+  int pending_touch_replay_sync_serial;
+  Atom touch_replay_sync_atom;
+
   int xinput_opcode;
   int xinput_event_base;
   int xinput_error_base;
@@ -169,6 +173,26 @@ meta_backend_x11_translate_device_event (MetaBackendX11 *x11,
 }
 
 static void
+maybe_translate_touch_replay_pointer_event (MetaBackendX11 *x11,
+                                            XIDeviceEvent  *device_event)
+{
+  MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
+
+  if (!device_event->send_event &&
+      device_event->time != META_CURRENT_TIME &&
+      priv->current_touch_replay_sync_serial !=
+      priv->pending_touch_replay_sync_serial &&
+      XSERVER_TIME_IS_BEFORE (device_event->time, priv->latest_evtime))
+    {
+      /* Emulated pointer events received after XIRejectTouch is received
+       * on a passive touch grab will contain older timestamps, update those
+       * so we dont get InvalidTime at grabs.
+       */
+      device_event->time = priv->latest_evtime;
+    }
+}
+
+static void
 translate_device_event (MetaBackendX11 *x11,
                         XIDeviceEvent  *device_event)
 {
@@ -177,19 +201,7 @@ translate_device_event (MetaBackendX11 *x11,
   meta_backend_x11_translate_device_event (x11, device_event);
 
   if (!device_event->send_event && device_event->time != META_CURRENT_TIME)
-    {
-      if (XSERVER_TIME_IS_BEFORE (device_event->time, priv->latest_evtime))
-        {
-          /* Emulated pointer events received after XIRejectTouch is received
-           * on a passive touch grab will contain older timestamps, update those
-           * so we dont get InvalidTime at grabs.
-           */
-          device_event->time = priv->latest_evtime;
-        }
-
-      /* Update the internal latest evtime, for any possible later use */
-      priv->latest_evtime = device_event->time;
-    }
+    priv->latest_evtime = device_event->time;
 }
 
 static void
@@ -254,6 +266,9 @@ maybe_spoof_event_as_stage_event (MetaBackendX11 *x11,
     case XI_Motion:
     case XI_ButtonPress:
     case XI_ButtonRelease:
+      maybe_translate_touch_replay_pointer_event (x11,
+                                                  (XIDeviceEvent *) input_event);
+      /* Intentional fall-through */
     case XI_KeyPress:
     case XI_KeyRelease:
     case XI_TouchBegin:
@@ -321,6 +336,17 @@ handle_host_xevent (MetaBackend *backend,
   MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
   gboolean bypass_clutter = FALSE;
 
+  switch (event->type)
+    {
+    case ClientMessage:
+      if (event->xclient.window == meta_backend_x11_get_xwindow (x11) &&
+          event->xclient.message_type == priv->touch_replay_sync_atom)
+        priv->current_touch_replay_sync_serial = event->xclient.data.l[0];
+      break;
+    default:
+      break;
+    }
+
   XGetEventData (priv->xdisplay, &event->xcookie);
 
   {
@@ -528,6 +554,10 @@ meta_backend_x11_post_init (MetaBackend *backend)
   monitor_manager = meta_backend_get_monitor_manager (backend);
   g_signal_connect (monitor_manager, "monitors-changed-internal",
                     G_CALLBACK (on_monitors_changed), backend);
+
+  priv->touch_replay_sync_atom = XInternAtom (priv->xdisplay,
+                                              "_MUTTER_TOUCH_SEQUENCE_SYNC",
+                                              False);
 }
 
 static ClutterBackend *
@@ -604,6 +634,21 @@ meta_backend_x11_finish_touch_sequence (MetaBackend          *backend,
                       META_VIRTUAL_CORE_POINTER_ID,
                       clutter_x11_event_sequence_get_touch_detail (sequence),
                       DefaultRootWindow (priv->xdisplay), event_mode);
+
+  if (state == META_SEQUENCE_REJECTED)
+    {
+      XClientMessageEvent ev;
+
+      ev = (XClientMessageEvent) {
+        .type = ClientMessage,
+        .window = meta_backend_x11_get_xwindow (x11),
+        .message_type = priv->touch_replay_sync_atom,
+        .format = 32,
+        .data.l[0] = ++priv->pending_touch_replay_sync_serial,
+      };
+      XSendEvent (priv->xdisplay, meta_backend_x11_get_xwindow (x11),
+                  False, 0, (XEvent *) &ev);
+    }
 }
 
 static void