app: GtkAction -> GAction madness part two

Change all action callbacks so they can be invoked by a GAction:

- add GimpActionCallback typedef:
  void (* cb) (GimpAction*, GVariant*, gpointer)
- change all action callbacks to the GimpActionCallback signature
- add "gimp-activate" and "gimp-change-state" signals to GimpAction,
  with the same signature as the resp. GAction signals
- remove all other custom action signals and only use the new
  GimpAction signals
- pass around appropriate GVariants containing booleans, int32,
  strings
- badly hack around to force a GimpProcedure pointer into a
  uint64 variant
- remove all G_CALLBACK() casts from all action callbacks,
  they all have the same signature now

(cherry picked from commit 3b6b3fc189)

app/widgets/gimpprocedureaction.c

@@ -25,20 +25,13 @@
 
 #include "widgets-types.h"
 
-#include "core/gimpmarshal.h"
-
 #include "pdb/gimpprocedure.h"
 
 #include "gimpaction.h"
+#include "gimpaction-history.h"
 #include "gimpprocedureaction.h"
 
 
-enum
-{
-  SELECTED,
-  LAST_SIGNAL
-};
-
 enum
 {
   PROP_0,
@@ -66,8 +59,6 @@ G_DEFINE_TYPE (GimpProcedureAction, gimp_procedure_action,
 
 #define parent_class gimp_procedure_action_parent_class
 
-static guint action_signals[LAST_SIGNAL] = { 0 };
-
 
 static void
 gimp_procedure_action_class_init (GimpProcedureActionClass *klass)
@@ -87,16 +78,6 @@ gimp_procedure_action_class_init (GimpProcedureActionClass *klass)
                                                         NULL, NULL,
                                                         GIMP_TYPE_PROCEDURE,
                                                         GIMP_PARAM_READWRITE));
-
-  action_signals[SELECTED] =
-    g_signal_new ("selected",
-                  G_TYPE_FROM_CLASS (klass),
-                  G_SIGNAL_RUN_FIRST,
-                  G_STRUCT_OFFSET (GimpProcedureActionClass, selected),
-                  NULL, NULL,
-                  gimp_marshal_VOID__OBJECT,
-                  G_TYPE_NONE, 1,
-                  GIMP_TYPE_PROCEDURE);
 }
 
 static void
@@ -161,15 +142,19 @@ gimp_procedure_action_activate (GtkAction *action)
 {
   GimpProcedureAction *procedure_action = GIMP_PROCEDURE_ACTION (action);
 
-  GTK_ACTION_CLASS (parent_class)->activate (action);
-
   /* Not all actions have procedures associated with them, for example
    * unused "filters-recent-[N]" actions, so check for NULL before we
    * invoke the action
    */
   if (procedure_action->procedure)
-    gimp_procedure_action_selected (procedure_action,
-                                    procedure_action->procedure);
+    {
+      gsize hack = GPOINTER_TO_SIZE (procedure_action->procedure);
+
+      gimp_action_emit_activate (GIMP_ACTION (action),
+                                 g_variant_new_uint64 (hack));
+
+      gimp_action_history_action_activated (GIMP_ACTION (action));
+    }
 }
 
 static void
@@ -241,12 +226,3 @@ gimp_procedure_action_new (const gchar   *name,
 
   return action;
 }
-
-void
-gimp_procedure_action_selected (GimpProcedureAction *action,
-                                GimpProcedure       *procedure)
-{
-  g_return_if_fail (GIMP_IS_PROCEDURE_ACTION (action));
-
-  g_signal_emit (action, action_signals[SELECTED], 0, procedure);
-}