[mutter] Take the touch grab in MetaBackendX11

[Jasper St. Pierre <jstpierre src gnome org>]

commit 55354f5c38a0a2722ae53da8bb587e75042c3a16
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Jul 14 09:41:10 2014 -0400

    Take the touch grab in MetaBackendX11
    
    This means that it won't trigger when we're running as a Wayland
    compositor, which will cause a few warnings and possibly more
    brokenness.

 src/backends/x11/meta-backend-x11.c |   20 ++++++++++++++++++++
 src/core/display.c                  |   31 -------------------------------
 2 files changed, 20 insertions(+), 31 deletions(-)
---
diff --git a/src/backends/x11/meta-backend-x11.c b/src/backends/x11/meta-backend-x11.c
index 9f3fe1a..c7440e2 100644
--- a/src/backends/x11/meta-backend-x11.c
+++ b/src/backends/x11/meta-backend-x11.c
@@ -253,6 +253,24 @@ x_event_source_new (MetaBackend *backend)
 }
 
 static void
+take_touch_grab (MetaBackend *backend)
+{
+  MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
+  MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
+  unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
+  XIEventMask mask = { META_VIRTUAL_CORE_POINTER_ID, sizeof (mask_bits), mask_bits };
+  XIGrabModifiers mods = { XIAnyModifier, 0 };
+
+  XISetMask (mask.mask, XI_TouchBegin);
+  XISetMask (mask.mask, XI_TouchUpdate);
+  XISetMask (mask.mask, XI_TouchEnd);
+
+  XIGrabTouchBegin (priv->xdisplay, META_VIRTUAL_CORE_POINTER_ID,
+                    DefaultRootWindow (priv->xdisplay),
+                    False, &mask, 1, &mods);
+}
+
+static void
 meta_backend_x11_post_init (MetaBackend *backend)
 {
   MetaBackendX11 *x11 = META_BACKEND_X11 (backend);
@@ -289,6 +307,8 @@ meta_backend_x11_post_init (MetaBackend *backend)
       meta_fatal ("X server doesn't have the XInput extension, version 2.2 or newer\n");
   }
 
+  take_touch_grab (backend);
+
   META_BACKEND_CLASS (meta_backend_x11_parent_class)->post_init (backend);
 }
 
diff --git a/src/core/display.c b/src/core/display.c
index 228f512..fc7948e 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -428,35 +428,6 @@ gesture_tracker_state_changed (MetaGestureTracker   *tracker,
                       DefaultRootWindow (display->xdisplay), event_mode);
 }
 
-static void
-meta_display_grab_window_touch (MetaDisplay *display,
-                                Window       xwindow)
-{
-  MetaBackendX11 *backend = META_BACKEND_X11 (meta_get_backend ());
-  unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
-  XIEventMask mask = { META_VIRTUAL_CORE_POINTER_ID, sizeof (mask_bits), mask_bits };
-  XIGrabModifiers mods = { XIAnyModifier, 0 };
-
-  XISetMask (mask.mask, XI_TouchBegin);
-  XISetMask (mask.mask, XI_TouchUpdate);
-  XISetMask (mask.mask, XI_TouchEnd);
-
-  XIGrabTouchBegin (meta_backend_x11_get_xdisplay (backend),
-                    META_VIRTUAL_CORE_POINTER_ID,
-                    xwindow, False, &mask, 1, &mods);
-}
-
-static void
-meta_display_ungrab_window_touch (MetaDisplay *display,
-                                  Window       xwindow)
-{
-  MetaBackendX11 *backend = META_BACKEND_X11 (meta_get_backend ());
-  XIGrabModifiers mods = { XIAnyModifier, 0 };
-
-  XIUngrabTouchBegin (meta_backend_x11_get_xdisplay (backend),
-                      META_VIRTUAL_CORE_POINTER_ID, xwindow, 1, &mods);
-}
-
 /**
  * meta_display_open:
  *
@@ -857,7 +828,6 @@ meta_display_open (void)
   display->gesture_tracker = meta_gesture_tracker_new ();
   g_signal_connect (display->gesture_tracker, "state-changed",
                     G_CALLBACK (gesture_tracker_state_changed), display);
-  meta_display_grab_window_touch (display, DefaultRootWindow (display->xdisplay));
 
   /* We know that if mutter is running as a Wayland compositor,
    * we start out with no windows.
@@ -1029,7 +999,6 @@ meta_display_close (MetaDisplay *display,
 
   meta_display_remove_autoraise_callback (display);
 
-  meta_display_ungrab_window_touch (display, DefaultRootWindow (display->xdisplay));
   g_clear_object (&display->gesture_tracker);
 
   if (display->focus_timeout_id)