efl_ui: activate widget focus on efl.ui.item.

Summary:
Unlikely efl.ui.Layout, Item need to be focusable,
so it may traverse list by your command of focus moving.

Test Plan:
tested in
efl_ui_list_example_1.c
efl_ui_grid_example_1.c
check whether item show their focus properly.

scroll feature is not yet supported by efl_ui_scroll itself.

Reviewers: eagleeye, cedric, Hermet, felipealmeida, bu5hm4n

Reviewed By: bu5hm4n

Subscribers: bu5hm4n, cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D7465

src/lib/elementary/efl_ui_item.c

@@ -216,6 +216,9 @@ _efl_ui_item_efl_object_finalize(Eo *obj, Efl_Ui_Item_Data *pd EINA_UNUSED)
    eo = efl_finalize(efl_super(obj, MY_CLASS));
    ELM_WIDGET_DATA_GET_OR_RETURN(eo, wd, eo);
 
+   /* Support Item Focus Feature */
+   elm_widget_can_focus_set(obj, EINA_TRUE);
+
    _item_mouse_callback_add(wd->resize_obj, eo);
    return eo;
 }