Blocks not sorted by weight before building region

Blocks do not appear to sort by weight before being rendered.
I think the problem is in plugins/context_reaction_block.inc
in the blockgs_get_blocks_by_region

  /**
  * Get a renderable array of a region containing all enabled blocks.
  */
  function block_get_blocks_by_region($region) {
    module_load_include('module', 'block', 'block');

    $build = array();
    if ($list = $this->block_list($region)) {
      $build = _block_get_renderable_array($list);
    } 
    if ($this->is_editable_region($region)) {
      $build = $this->editable_region($region, $build);
    } 
    return $build;
  } 

The blocks are not sort before being hand of to _blocl_get_renderable_array which reset the weight to the order of $list.

so i think that doing a sort before and with

      uasort($list, 'block_sort');

would do the trick