[mutter/wip/carlosg/native-numlock-fix] wayland: Ensure to forward numlock state to clients

[Carlos Garnacho <carlosg src gnome org>]

commit 59fed9194b999af561bfcbf4142a97f3074e1d6a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Oct 7 19:14:20 2019 +0200

    wayland: Ensure to forward numlock state to clients
    
    This makes sure the numlock key lock state is forwarded to the wl_keyboard
    internal state, notably on startup and after keymap changes.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/769

 src/wayland/meta-wayland-keyboard.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/src/wayland/meta-wayland-keyboard.c b/src/wayland/meta-wayland-keyboard.c
index 0c3447137..d74ef0dfa 100644
--- a/src/wayland/meta-wayland-keyboard.c
+++ b/src/wayland/meta-wayland-keyboard.c
@@ -400,9 +400,10 @@ static void
 meta_wayland_keyboard_update_xkb_state (MetaWaylandKeyboard *keyboard)
 {
   MetaWaylandXkbInfo *xkb_info = &keyboard->xkb_info;
-  xkb_mod_mask_t latched, locked;
+  xkb_mod_mask_t latched, locked, numlock;
   MetaBackend *backend = meta_get_backend ();
   xkb_layout_index_t layout_idx;
+  ClutterKeymap *keymap;
 
   /* Preserve latched/locked modifiers state */
   if (xkb_info->state)
@@ -416,6 +417,14 @@ meta_wayland_keyboard_update_xkb_state (MetaWaylandKeyboard *keyboard)
       latched = locked = 0;
     }
 
+  keymap = clutter_backend_get_keymap (clutter_get_default_backend ());
+  numlock = (1 <<  xkb_keymap_mod_get_index (xkb_info->keymap, "Mod2"));
+
+  if (clutter_keymap_get_num_lock_state (keymap))
+    locked |= numlock;
+  else
+    locked &= ~numlock;
+
   xkb_info->state = xkb_state_new (xkb_info->keymap);
 
   layout_idx = meta_backend_get_keymap_layout_group (backend);