edje: add event for inform about circular dependency

This commit add the event "circular,dependency" for edje object. Given
event is called when edje found the circular dependency between parts
in object. This event will be usefull and informative paired with
Edje_Edit API.

src/bin/edje/edje_player.c

@@ -835,6 +835,27 @@ _edje_reload(void *data EINA_UNUSED, Evas_Object *obj, const char *emission EINA
    _edje_load_or_show_error(obj, file, group);
 }
 
+static void
+_edje_circul(void *data, Evas_Object *obj EINA_UNUSED, void *event_info)
+{
+   char buf[1024] = "";
+   Eina_List *parts = event_info;
+   Eina_List *l;
+   char *part_name;
+   char *group = data;
+
+   part_name = eina_list_data_get(eina_list_last(parts));
+   strncat(buf, part_name, strlen(part_name));
+   EINA_LIST_FOREACH(parts, l, part_name)
+     {
+        strncat(buf, " -> ", strlen(" -> "));
+        strncat(buf, part_name, strlen(part_name));
+     }
+
+   fprintf(stderr, "Group '%s' have a circul dependency between parts: %s\n",
+           group, buf);
+}
+
 static Eina_Bool
 _edje_load_or_show_error(Evas_Object *edje, const char *file, const char *group)
 {
@@ -930,6 +951,7 @@ _create_edje(Evas *evas, const struct opts *opts)
              edje_file_collection_list_free(groups);
           }
      }
+   evas_object_smart_callback_add(edje, "circular,dependency", _edje_circul, opts->group);
 
    edje_object_size_max_get(edje, &maxw, &maxh);
    edje_object_size_min_get(edje, &minw, &minh);

src/lib/edje/edje_calc.c

@@ -93,7 +93,6 @@ static void                          _edje_part_recalc_single(Edje *ed, Edje_Rea
                                                  pd_##type->type.orientation.data[2], \
                                                  pd_##type->type.orientation.data[3]);
 
-
 void
 _edje_calc_params_clear(Edje_Calc_Params *p)
 {
@@ -3846,6 +3845,7 @@ _edje_part_recalc(Edje *ed, Edje_Real_Part *ep, int flags, Edje_Calc_Params *sta
                   strncat(depends_path, part_name,
                           sizeof(depends_path) - strlen(depends_path) - 1);
                }
+             efl_event_callback_legacy_call(ed->obj, EDJE_OBJECT_EVENT_CIRCULAR_DEPENDENCY, clist);
              ERR("Circular dependency in the group '%s' : %s",
                  ed->group, depends_path);
              eina_list_free(clist);

src/lib/edje/edje_object.eo

@@ -214,5 +214,6 @@ class Edje.Object (Efl.Canvas.Group, Efl.File, Efl.Container, Efl.Part,
    }
    events {
       recalc; [[Edje re-calculated the object.]]
+      circular,dependency; [[Edje found circular dependencies between parts of the object.]]
    }
 }