[libdazzle] shortcuts: add assertions

[Christian Hergert <chergert src gnome org>]

commit 41be46e95412bf9da0d91455465cffb15808a927
Author: Christian Hergert <chergert redhat com>
Date:   Sat Aug 10 20:42:06 2019 -0700

    shortcuts: add assertions

 src/shortcuts/dzl-shortcut-controller.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/shortcuts/dzl-shortcut-controller.c b/src/shortcuts/dzl-shortcut-controller.c
index af54f5f..03b3578 100644
--- a/src/shortcuts/dzl-shortcut-controller.c
+++ b/src/shortcuts/dzl-shortcut-controller.c
@@ -389,6 +389,8 @@ dzl_shortcut_controller_set_widget (DzlShortcutController *self,
           dzl_shortcut_controller_connect (self);
         }
 
+      g_assert (widget == priv->widget);
+
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_WIDGET]);
     }
 }
@@ -655,6 +657,8 @@ dzl_shortcut_controller_find (GtkWidget *widget)
       controller = g_object_get_qdata (G_OBJECT (widget), controller_quark);
     }
 
+  g_return_val_if_fail (DZL_IS_SHORTCUT_CONTROLLER (controller), NULL);
+
   return controller;
 }