[gtkmm] Gtk::ShortcutsShortcut: Derive directly from Widget

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 52f06cae6fd89f527bad7990a05b67af9550cd90
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed May 3 11:15:28 2017 +0200

    Gtk::ShortcutsShortcut: Derive directly from Widget
    
    GtkShortcutsShortcut is now derived directly from GtkWidget (was from GtkBox).
    It was changed more than 3 months ago. Gtkmm could still be built,
    but one of the demo programs crashed when executed.

 gtk/src/shortcutsshortcut.hg |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gtk/src/shortcutsshortcut.hg b/gtk/src/shortcutsshortcut.hg
index 7d39ba9..d7e7195 100644
--- a/gtk/src/shortcutsshortcut.hg
+++ b/gtk/src/shortcutsshortcut.hg
@@ -14,12 +14,12 @@
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <gtkmm/box.h>
+#include <gtkmm/widget.h>
 #include <gtkmm/enums.h>
 #include <giomm/icon.h>
 
 _DEFS(gtkmm,gtk)
-_PINCLUDE(gtkmm/private/box_p.h)
+_PINCLUDE(gtkmm/private/widget_p.h)
 
 namespace Gtk
 {
@@ -27,16 +27,16 @@ _WRAP_ENUM(ShortcutType, GtkShortcutType)
 
 /** Represents a keyboard shortcut in a ShortcutsWindow.
  *
- * A ShortcutsShortcut represents a single keyboard shortcut or gesture
+ * A %ShortcutsShortcut represents a single keyboard shortcut or gesture
  * with a short text. This widget is only meant to be used with ShortcutsWindow.
  *
  * @newin{3,20}
  *
  * @ingroup Widgets
  */
-class ShortcutsShortcut : public Box
+class ShortcutsShortcut : public Widget
 {
-  _CLASS_GTKOBJECT(ShortcutsShortcut, GtkShortcutsShortcut, GTK_SHORTCUTS_SHORTCUT, Box, GtkBox)
+  _CLASS_GTKOBJECT(ShortcutsShortcut, GtkShortcutsShortcut, GTK_SHORTCUTS_SHORTCUT, Widget, GtkWidget)
 
 public:
   _CTOR_DEFAULT