[Pidgin] #4449: Use MD5 login for ICQ. Fall back to XOR upon failure.

[Pidgin]

#4449: Use MD5 login for ICQ.  Fall back to XOR upon failure.
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  Reporter:  MarkDoliner  |       Owner:  markdoliner    
      Type:  patch        |      Status:  new            
  Priority:  minor        |   Milestone:  Patches welcome
 Component:  ICQ          |     Version:  2.3.1          
Resolution:               |    Keywords:                 
   Pending:  0            |  
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Comment (by db42):

 Ok, upon investigating this issue, it seems that the ICQ servers would
 kick the client if he would send an MD5 auth request (which uses FLAP type
 2) before sending a regular message of any type on the LOGIN channel (FLAP
 type 1).

 My patch sends an empty FLAP type 1 message and only then sends the
 regular AIM MD5 auth mechanizm as used before, this way ICQ doesn't kick
 us directly, and the login works when disabling ICQ XOR support.

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Ticket URL: <http://developer.pidgin.im/ticket/4449#comment:6>
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