evas/box: avoid triggering smart_move callback

any time an evas box is moved, it flags itself to do a recalc on all of
its contents in the next render. evas box also inherits from smart clipped
class, however, which means that it will also move all of its contents
immediately on every single move. this results in something like:

move(box) -> for content in box { move(content) } -> render ->
  recalc(box) -> for content in box { calc(content); move(content); }

which is massively inefficient and results in box being completely unusable
once it has a large number of contents

by skipping immediate move() calls for all the box contents, we can bring this
performance back to usable levels

@fix

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D9336

src/lib/evas/canvas/evas_object_box.c

@@ -443,10 +443,16 @@ _evas_box_efl_gfx_entity_size_set(Eo *o, Evas_Object_Box_Data *_pd EINA_UNUSED,
 EOLIAN static void
 _evas_box_efl_gfx_entity_position_set(Eo *o, Evas_Object_Box_Data *_pd EINA_UNUSED, Eina_Position2D pos)
 {
+   Evas_Object_Smart_Clipped_Data *cso = evas_object_smart_data_get(o);
    if (_evas_object_intercept_call(o, EVAS_OBJECT_INTERCEPT_CB_MOVE , 0, pos.x, pos.y))
      return;
 
-   efl_gfx_entity_position_set(efl_super(o, MY_CLASS), pos);
+   efl_gfx_entity_position_set(cso->clipper, pos);
+   /* this skips the call to _evas_object_smart_clipped_smart_move_internal
+    * since box internals will automatically recalc all the child positions
+    * at a later point
+    */
+   efl_gfx_entity_position_set(efl_super(o, EFL_CANVAS_GROUP_CLASS), pos);
    evas_object_smart_changed(o);
 }