[mutter] wayland-keyboard: Notify clients of pending modifier state changes

[Rui Matos <rtcm src gnome org>]

commit e284370013013967a6483de9c067ad4fde4954f9
Author: Rui Matos <tiagomatos gmail com>
Date:   Tue Nov 3 17:58:16 2015 +0100

    wayland-keyboard: Notify clients of pending modifier state changes
    
    If we get a key event but still have pending modifier state changes we
    need to send a modifiers event right away so that the key event can be
    interpreted by clients correctly modified.
    
    This case could happen when mutter/gnome-shell itself consumes the
    modifier key press event such as with the overview key which by
    default is triggered on super press.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=748526

 src/wayland/meta-wayland-keyboard.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-keyboard.c b/src/wayland/meta-wayland-keyboard.c
index 1772460..003e483 100644
--- a/src/wayland/meta-wayland-keyboard.c
+++ b/src/wayland/meta-wayland-keyboard.c
@@ -555,6 +555,13 @@ meta_wayland_keyboard_update (MetaWaylandKeyboard *keyboard,
 {
   gboolean is_press = event->type == CLUTTER_KEY_PRESS;
 
+  /* If we get a key event but still have pending modifier state
+   * changes from a previous event that didn't get cleared, we need to
+   * send that state right away so that the new key event can be
+   * interpreted by clients correctly modified. */
+  if (keyboard->mods_changed)
+    notify_modifiers (keyboard);
+
   keyboard->mods_changed = xkb_state_update_key (keyboard->xkb_info.state,
                                                  event->hardware_keycode,
                                                  is_press ? XKB_KEY_DOWN : XKB_KEY_UP);