efl_ui_position_manager: review cache accesses

in position manager grid and list, there are caches for the sizes, so
the access within placing the item is faster. The cache sometimes is
invalidated, which means, it must be rebuild before accessing it.

This commit is the result of reviewing all the accesses, that the
correct item is available.

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D10065

src/lib/elementary/efl_ui_position_manager_grid.c

@@ -448,6 +448,8 @@ _reposition_content(Eo *obj EINA_UNUSED, Efl_Ui_Position_Manager_Grid_Data *pd)
    if (pd->max_min_size.w <= 0 || pd->max_min_size.h <= 0) return;
    if (!eina_inarray_count(pd->group_cache)) return;
 
+   _size_cache_require(obj, pd);
+
    //space size contains the amount of space that is outside the viewport (either to the top or to the left)
    space_size.w = (MAX(pd->last_viewport_size.w - pd->viewport.w, 0))*pd->scroll_position.x;
    space_size.h = (MAX(pd->last_viewport_size.h - pd->viewport.h, 0))*pd->scroll_position.y;

src/lib/elementary/efl_ui_position_manager_list.c

@@ -417,6 +417,8 @@ _efl_ui_position_manager_list_efl_ui_position_manager_entity_position_single_ite
 
    if (!pd->size) return EINA_RECT(0,0,0,0);
 
+   cache_require(obj, pd);
+
    //space size contains the amount of space that is outside the viewport (either to the top or to the left)
    space_size.w = (MAX(pd->abs_size.w - pd->viewport.w, 0))*pd->scroll_position.x;
    space_size.h = (MAX(pd->abs_size.h - pd->viewport.h, 0))*pd->scroll_position.y;