[mutter] ui: Disable multidevice support in GDK

[Florian Müllner <fmuellner src gnome org>]

commit 53777b133b0e3f68243e576f50daaefac7038fb4
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Dec 15 13:23:08 2010 +0100

    ui: Disable multidevice support in GDK
    
    GDK now uses XI2 by default, which conflicts with the X calls done
    in mutter. Enforce the previous behavior.

 src/ui/ui.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 929e539..5068ecb 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -60,6 +60,16 @@ struct _MetaUI
 void
 meta_ui_init (int *argc, char ***argv)
 {
+  /* As of 2.91.7, Gdk uses XI2 by default, which conflicts with the
+   * direct X calls we use - in particular, events caused by calls to
+   * XGrabPointer/XGrabKeyboard are no longer understood by GDK, while
+   * GDK will no longer generate the core XEvents we process.
+   * So at least for now, enforce the previous behavior.
+   */
+#if GTK_CHECK_VERSION(2, 91, 7)
+  gdk_disable_multidevice ();
+#endif
+
   if (!gtk_init_check (argc, argv))
     meta_fatal ("Unable to open X display %s\n", XDisplayName (NULL));