URLs with underscores in the domain name breaks linking
Submitted by Michael Diamond
Previously reported as Bug 570037 but closed as invalid.
Hostnames may not allow underscores, but domain names certainly do (as evidenced by services that use them, and browsers that resolve them). According to http://stackoverflow.com/a/2183140 the relevant RFC is RFC 1034, not RFC 2396.
Even if it were in violation of the appropriate RFCs these URLs exist in the wild and gnome-terminal could still support linking to them.