[gtk+/xi2] GdkDevice: Don't allow master devices to be disabled.

[Carlos Garnacho <carlosg src gnome org>]

commit d25b0b0db2e60673d97790f792889ba8cfe66d68
Author: Carlos Garnacho <carlos gnome org>
Date:   Sun Oct 11 01:48:52 2009 +0200

    GdkDevice: Don't allow master devices to be disabled.

 gdk/gdkdevice.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkdevice.c b/gdk/gdkdevice.c
index 6e54f32..4c1413b 100644
--- a/gdk/gdkdevice.c
+++ b/gdk/gdkdevice.c
@@ -366,6 +366,10 @@ gdk_device_set_mode (GdkDevice    *device,
   if (device->mode == mode)
     return TRUE;
 
+  if (mode == GDK_MODE_DISABLED &&
+      gdk_device_get_device_type (device) == GDK_DEVICE_TYPE_MASTER)
+    return FALSE;
+
   /* FIXME: setting has_cursor when mode is window? */
 
   device->mode = mode;