[Pidgin] #4855: msimprpl should verify the username is valid before setting

[Pidgin]

#4855: msimprpl should verify the username is valid before setting
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  Reporter:  Jaywalker  |       Owner:  jeff 
      Type:  defect     |      Status:  new  
  Priority:  minor      |   Milestone:       
 Component:  MySpace    |     Version:  2.3.1
Resolution:             |    Keywords:       
   Pending:  0          |  
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Comment (by Jaywalker):

 I think that we should implement #2789, then using that function, set the
 username with caps and spacing after using the 9,14 command on the
 canonical username. We need to be sure the user realizes if there are
 spaces and caps, those only affect his msim username, not the myspace.com
 URL.

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Ticket URL: <http://developer.pidgin.im/ticket/4855#comment:2>
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