handle compositor animation race condition when changing effects

this is more of an academic case than any existing scenario, but
it's possible that an effect may be stopped by something attempting
to trigger another effect during the animation

src/bin/e_comp_object.c

@@ -3612,10 +3612,20 @@ e_comp_object_effect_set(Evas_Object *obj, const char *effect)
         if (!e_theme_edje_object_set(cw->effect_obj, "base/theme/comp", buf))
           if (!e_theme_edje_object_set(cw->effect_obj, "base/theme/comp", "e/comp/effects/none"))
             {
+               if (cw->effect_running)
+                 {
+                    if (!e_comp_object_effect_stop(obj, evas_object_data_get(cw->effect_obj, "_e_comp.end_cb")))
+                      return EINA_FALSE;
+                 }
                cw->effect_set = EINA_FALSE;
                return cw->effect_set;
             }
      }
+   if (cw->effect_running)
+     {
+        if (!e_comp_object_effect_stop(obj, evas_object_data_get(cw->effect_obj, "_e_comp.end_cb")))
+          return EINA_FALSE;
+     }
    edje_object_part_swallow(cw->effect_obj, "e.swallow.content", cw->shobj);
    if (cw->effect_clip)
      {