[gtk+] wayland: Fix the map_virtual_modifiers implementation

[Matthias Clasen <matthiasc src gnome org>]

commit 5ba8a25d2966dc2cdc67a350d4ea6c4ecb293919
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Apr 16 23:16:12 2016 -0400

    wayland: Fix the map_virtual_modifiers implementation
    
    We were not stripping real modifiers out, and thus always
    thought there's a conflict when the passed in modifiers
    included any real modifiers.

 gdk/wayland/gdkkeys-wayland.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/wayland/gdkkeys-wayland.c b/gdk/wayland/gdkkeys-wayland.c
index d73199f..eee2907 100644
--- a/gdk/wayland/gdkkeys-wayland.c
+++ b/gdk/wayland/gdkkeys-wayland.c
@@ -420,7 +420,7 @@ gdk_wayland_keymap_map_virtual_modifiers (GdkKeymap       *keymap,
   mods = get_xkb_modifiers (xkb_keymap, *state);
 
   xkb_state = xkb_state_new (xkb_keymap);
-  xkb_state_update_mask (xkb_state, mods, 0, 0, 0, 0, 0);
+  xkb_state_update_mask (xkb_state, mods & ~0xff, 0, 0, 0, 0, 0);
   mapped = xkb_state_serialize_mods (xkb_state, XKB_STATE_MODS_EFFECTIVE);
   if ((mapped & mods & 0xff) != 0)
     ret = FALSE;