Wrong file size after resizing an uploaded image

To reproduce:
1) Set maximum resolution for images to be uploaded.
2) Attach an image file exceeding the maximum resolution to a node. => drupal will show the file size reflecting the
original resolution. The wrong size information will persist even after submitting the node.

To fix:
Add one line calling clearstatcache in the function _upload_image. This will force the PHP to reread the
file size information after the resize operation. Otherwise, PHP will use the cached (wrong) file size.

function _upload_image($file) {
  $info = image_get_info($file->filepath);

  if ($info) {
    list($width, $height) = explode('x', variable_get('upload_max_resolution', 0));
    if ($width && $height) {
      $result = image_scale($file->filepath, $file->filepath, $width, $height);
      if ($result) {
        clearstatcache (); 
        $file->filesize = filesize($file->filepath);
        drupal_set_message(t('The image was resized to fit within the maximum allowed resolution of %resolution pixels.', array('%resolution' => variable_get('upload_max_resolution', 0))));
      }
    }
  }

  return $file;
}