Feature request: tab-complete JIDs from xmpp: links in the chat log

If somebody sends you an xmpp: URI, it would be great to have that as a tab completion target.

Example:

13:37 friend> come join us in the sacred place at xmpp:youknowwhere@chat.yax.im?join

Now typing /join you<Tab> should yield the JID of the advertised MUC.