id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
21153,supporting protocol-relative urls,nagyv,,"changing http:// and https:// generated links to // links would easily add support for hosting a site both under http and https easily

one place I've found this to be changed is in wp-includes/link-template.php around line 2006

the first if could be changed to:

$url = str_replace( ""https://"", ""//"", $url)
$url = str_replace( ""http://"", ""//"", $url)",enhancement,new,normal,Awaiting Review,General,3.3.2,normal,,,