Image src not properly URL encoded

When using the inline module to load an image into the body of a blog post, I ran into a problem with one of three images. It appears the problem is that the image has a % in the filename. The src in the img tag was:

http://example.com/sites/default/files/imagecache/inline/blog/2009/02/04...

Which, if I go there directly, gives me a "400 Bad Request" error. However, if I properly URL encode the % sign:

http://example.com/sites/default/files/imagecache/inline/blog/2009/02/04...

It works fine. I will note that the link that wraps the image is correctly URL encoded ().

I believe the issue is that imagecache_create_url() should call drupal_urlencode() on the $path variable before passing it to file_create_url(). At least, that seems to fix it on my site.

function imagecache_create_url($presetname, $path) {
  $path = _imagecache_strip_file_directory($path);
  return file_create_url(file_directory_path() .'/imagecache/'. $presetname .'/'. drupal_urlencode($path));
}