[mutter] backend: Only center pointer when not headless

[Jonas Ådahl <jadahl src gnome org>]

commit 20cd885443c597faab5fa33ce1800735d7b06b9a
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Jan 12 13:49:36 2017 +0800

    backend: Only center pointer when not headless
    
    When we are headless, there is no logical monitor to try to center the
    pointer on, so just skip it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-backend.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index d4ec4e6..9f22a94 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -147,7 +147,8 @@ meta_backend_monitors_changed (MetaBackend *backend)
     {
       /* If we're outside all monitors, warp the pointer back inside */
       if (!meta_monitor_manager_get_logical_monitor_at (monitor_manager,
-                                                        point.x, point.y))
+                                                        point.x, point.y) &&
+          !meta_monitor_manager_is_headless (monitor_manager))
         center_pointer (backend);
     }
 }