Move gtk_object_handled_accumulator

This used to live in gtknotebook.c. Since we may use it in
other places in the future, move it to gtkprivate.c where we
already have other shared accumulators.

gtk/gtknotebook.c

@@ -644,22 +644,6 @@ add_reorder_bindings (GtkBindingSet    *binding_set,
                                 G_TYPE_BOOLEAN, move_to_last);
 }
 
-static gboolean
-gtk_object_handled_accumulator (GSignalInvocationHint *ihint,
-                                GValue                *return_accu,
-                                const GValue          *handler_return,
-                                gpointer               dummy)
-{
-  gboolean continue_emission;
-  GObject *object;
-
-  object = g_value_get_object (handler_return);
-  g_value_set_object (return_accu, object);
-  continue_emission = !object;
-
-  return continue_emission;
-}
-
 static void
 gtk_notebook_compute_expand (GtkWidget *widget,
                              gboolean  *hexpand_p,

gtk/gtkprivate.c

@@ -158,6 +158,22 @@ _gtk_single_string_accumulator (GSignalInvocationHint *ihint,
   return continue_emission;
 }
 
+gboolean
+gtk_object_handled_accumulator (GSignalInvocationHint *ihint,
+                                GValue                *return_accu,
+                                const GValue          *handler_return,
+                                gpointer               dummy)
+{
+  gboolean continue_emission;
+  GObject *object;
+
+  object = g_value_get_object (handler_return);
+  g_value_set_object (return_accu, object);
+  continue_emission = !object;
+
+  return continue_emission;
+}
+
 GdkModifierType
 _gtk_replace_virtual_modifiers (GdkKeymap       *keymap,
                                 GdkModifierType  modifiers)

gtk/gtkprivate.h

@@ -73,6 +73,11 @@ gboolean _gtk_single_string_accumulator   (GSignalInvocationHint *ihint,
                                            const GValue          *handler_return,
                                            gpointer               dummy);
 
+gboolean gtk_object_handled_accumulator   (GSignalInvocationHint *ihint,
+                                           GValue                *return_accu,
+                                           const GValue          *handler_return,
+                                           gpointer               dummy);
+
 GdkModifierType _gtk_replace_virtual_modifiers (GdkKeymap       *keymap,
                                                 GdkModifierType  modifiers);
 GdkModifierType _gtk_get_primary_accel_mod     (void);