[gnome-flashback] input-sources: force locked group

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 661952443e481b9b9e040168c4c2097299fe5ecc
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Oct 14 03:47:24 2015 +0300

    input-sources: force locked group

 .../libinput-sources/gf-keyboard-manager.c         |   34 ++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/libinput-sources/gf-keyboard-manager.c 
b/gnome-flashback/libinput-sources/gf-keyboard-manager.c
index 55a9498..422a545 100644
--- a/gnome-flashback/libinput-sources/gf-keyboard-manager.c
+++ b/gnome-flashback/libinput-sources/gf-keyboard-manager.c
@@ -65,6 +65,8 @@ struct _GfKeyboardManager
   gchar        *layouts;
   gchar        *variants;
   gchar        *options;
+
+  guint         locked_group;
 };
 
 G_DEFINE_TYPE (GfKeyboardManager, gf_keyboard_manager, G_TYPE_OBJECT)
@@ -330,6 +332,7 @@ apply_layout_index (GfKeyboardManager *manager,
   if (manager->xkb_event_base == -1)
     return;
 
+  manager->locked_group = index;
   XkbLockGroup (manager->xdisplay, XkbUseCoreKbd, index);
 }
 
@@ -375,6 +378,33 @@ get_locale_layout_info (GfKeyboardManager *manager)
     }
 }
 
+static GdkFilterReturn
+filter_func (GdkXEvent *xevent,
+             GdkEvent  *event,
+             gpointer   user_data)
+{
+  GfKeyboardManager *manager;
+  XEvent *ev;
+  XkbEvent *xkb_ev;
+
+  manager = GF_KEYBOARD_MANAGER (user_data);
+  ev = (XEvent *) xevent;
+
+  if (ev->type != manager->xkb_event_base)
+    return GDK_FILTER_CONTINUE;
+
+  xkb_ev = (XkbEvent *) ev;
+
+  if (xkb_ev->any.xkb_type == XkbStateNotify &&
+      xkb_ev->state.changed & XkbGroupLockMask)
+    {
+      if ((gint) manager->locked_group != xkb_ev->state.locked_group)
+        apply_layout_index (manager, manager->locked_group);
+    }
+
+  return GDK_FILTER_CONTINUE;
+}
+
 static void
 gf_keyboard_manager_dispose (GObject *object)
 {
@@ -394,6 +424,8 @@ gf_keyboard_manager_finalize (GObject *object)
 
   manager = GF_KEYBOARD_MANAGER (object);
 
+  gdk_window_remove_filter (NULL, filter_func, manager);
+
   if (manager->locale != 0)
     {
       layout_info_free (manager->locale);
@@ -458,6 +490,8 @@ gf_keyboard_manager_init (GfKeyboardManager *manager)
                            G_CONNECT_AFTER);
 
   get_locale_layout_info (manager);
+
+  gdk_window_add_filter (NULL, filter_func, manager);
 }
 
 /**