[Pidgin] #10541: Make XMPP MUC Username case-sensitive

[Pidgin]

#10541: Make XMPP MUC Username case-sensitive
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 Reporter:  prauscher  |       Owner:  deryni
     Type:  defect     |      Status:  new
Milestone:  3.0.0      |   Component:  XMPP
  Version:  2.5.5      |  Resolution:
 Keywords:             |
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Comment (by djfun):

 Not only case-sensitivity seems to be a problem but also a trailing space
 character (#16059).
 My understanding is that libpurple (purple_conv_chat_rename_user,
 purple_conv_chat_set_nick, ..) call purple_normalize for the room nick.
 XMPP (jabber_normalize in jutil.c) treats the incoming string (the room
 nick) as domain, which is why all characters in it get turned into
 lowercase and a trailing space character gets stripped.

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Ticket URL: <https://developer.pidgin.im/ticket/10541#comment:5>
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