Comment 6 for bug 587902

Steps to verify:

  1) have someone send you a private message
  2) you should see the messaging indicator turn blue, before responding to it have the sender change the IRC nick
  3) after they change their nick, click on the indicator
  4) you should be switched to the PM from that sender with the new nick

Regression potential is low, the old code was checking for the channel in the hash table and it would never match because it was a pointer.