Redmine

Auto-linking (i.e. when just writing a plain URL in the text field) is still restricted to the http/https or ftp/ftps protocols, both in Textile and the two Markdown implementations. While it is debatable if ftp links should be auto-linked nowadays, I don't think we should expand the list of protocols to avoid false-positives.

In any case, you can write explicit links with these protocols today, e.g. "Rake package":apt://rake will be rendered as Rake package when using Textile.

With your patch, the security implications mentioned by Eric still apply. As such, we should not add it to Redmine as is. I'd still like thank you for your contribution, even if rather belated :)