[libdazzle] shortcuts: fix tab/shifttab to change focus

[Christian Hergert <chergert src gnome org>]

commit bcd468060afad0e43aa805d4ae5120fee8a56817
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 7 14:23:45 2017 -0700

    shortcuts: fix tab/shifttab to change focus
    
    Since handling our own fallback delivery of events, we lose some of the
    default handling by gtkwindow. This allows the toplevel to activate a
    signal before we move on to processing application keybindings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787275

 src/shortcuts/dzl-shortcut-manager.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/src/shortcuts/dzl-shortcut-manager.c b/src/shortcuts/dzl-shortcut-manager.c
index ea5c565..be047ce 100644
--- a/src/shortcuts/dzl-shortcut-manager.c
+++ b/src/shortcuts/dzl-shortcut-manager.c
@@ -801,15 +801,25 @@ dzl_shortcut_manager_run_global (DzlShortcutManager     *self,
 static gboolean
 dzl_shortcut_manager_run_fallbacks (DzlShortcutManager     *self,
                                     GtkWidget              *widget,
+                                    GtkWidget              *toplevel,
                                     const DzlShortcutChord *chord)
 {
   g_assert (DZL_IS_SHORTCUT_MANAGER (self));
   g_assert (GTK_IS_WIDGET (widget));
+  g_assert (GTK_IS_WIDGET (toplevel));
   g_assert (chord != NULL);
 
   if (dzl_shortcut_chord_get_length (chord) == 1)
     {
       GApplication *app = g_application_get_default ();
+      GdkModifierType state;
+      guint keyval;
+
+      dzl_shortcut_chord_get_nth_key (chord, 0, &keyval, &state);
+
+      /* See if the toplevel activates this, like Tab, etc */
+      if (gtk_bindings_activate (G_OBJECT (toplevel), keyval, state))
+        return TRUE;
 
       if (GTK_IS_APPLICATION (app))
         {
@@ -930,7 +940,7 @@ dzl_shortcut_manager_handle_event (DzlShortcutManager *self,
       (match = dzl_shortcut_manager_run_phase (self, event, chord, DZL_SHORTCUT_PHASE_DISPATCH, widget, 
focus)) ||
       (match = dzl_shortcut_manager_run_phase (self, event, chord, DZL_SHORTCUT_PHASE_BUBBLE, widget, 
focus)) ||
       (match = dzl_shortcut_manager_run_global (self, event, chord, DZL_SHORTCUT_PHASE_BUBBLE, root, 
widget)) ||
-      (match = dzl_shortcut_manager_run_fallbacks (self, widget, chord)))
+      (match = dzl_shortcut_manager_run_fallbacks (self, widget, toplevel, chord)))
     ret = GDK_EVENT_STOP;
 
   DZL_TRACE_MSG ("match = %d", match);