non-english category prefix not working

[qamaz]

Reason: this lines wont work with non-english prefix without urlencode (canonical.php, line 363):

if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request
		return false;

So the function proceeds to redirect, non-english symbols are cut away from the string by wp_sanitize_redirect or somethig, and the user is redirected to 404.

Solution: put

$redirect_url = urlencode($redirect_url);

somewhere in the redirect_canonical() function (not sure about the place).

#14201