[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      |   Component:  MySpace
 Version:  2.3.1      |    Keywords:         
 Pending:  0          |  
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 MySpace only allows usernames to contain letters, numbers and underscores
 and the username must be less than or equal to 25 characters. Currently,
 the msim servers will return an error if one tries to set a username with
 invalid characters, but this is something msimprpl could check for before
 setting the username.

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