[gtk+] x11: Trap possible X error

[Matthias Clasen <matthiasc src gnome org>]

commit 7e7d7991cc8e7c7a2b50ce6530a8ebafd673516b
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue May 10 21:29:10 2016 -0400

    x11: Trap possible X error
    
    XIGetClientPointer can generate X errors (e.g. when the X server
    does not support XI2. Trap them and carry on.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766233

 gdk/x11/gdkdisplay-x11.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/gdk/x11/gdkdisplay-x11.c b/gdk/x11/gdkdisplay-x11.c
index f7c79c4..ad65e29 100644
--- a/gdk/x11/gdkdisplay-x11.c
+++ b/gdk/x11/gdkdisplay-x11.c
@@ -2881,10 +2881,14 @@ gdk_x11_display_get_default_seat (GdkDisplay *display)
 {
   GList *seats, *l;
   int device_id;
+  gboolean result = FALSE;
 
   seats = gdk_display_list_seats (display);
-  XIGetClientPointer (GDK_DISPLAY_XDISPLAY (display),
-                      None, &device_id);
+
+  gdk_x11_display_error_trap_push (display);
+  result = XIGetClientPointer (GDK_DISPLAY_XDISPLAY (display),
+                               None, &device_id);
+  gdk_x11_display_error_trap_pop_ignored (display);
 
   for (l = seats; l; l = l->next)
     {
@@ -2892,7 +2896,7 @@ gdk_x11_display_get_default_seat (GdkDisplay *display)
 
       pointer = gdk_seat_get_pointer (l->data);
 
-      if (gdk_x11_device_get_id (pointer) == device_id)
+      if (gdk_x11_device_get_id (pointer) == device_id || !result)
         {
           GdkSeat *seat = l->data;
           g_list_free (seats);