[Pidgin] #3467: Fix IRC handling of mIRC formatting

[Pidgin]

#3467: Fix IRC handling of mIRC formatting
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  Reporter:  rekkanoryo  |       Owner:  elb   
      Type:  patch       |      Status:  closed
  Priority:  minor       |   Milestone:  2.2.2 
 Component:  IRC         |     Version:  2.2.1 
Resolution:  fixed       |    Keywords:        
   Pending:  0           |  
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Comment (by rekkanoryo at cpw.pidgin.im):

 (In [6b57335241f2c9a501643280407bdc3374100dee]) Fix the mIRC format
 handling bug that causes incorrect display of received
 text.  The behavior of g_markup_escape_text changed in glib 2.12, which
 caused this bug.  This fix copies the working version of said function and
 the private helper function append_escaped_text() into our IRC prpl.

 Fixes #3467

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Ticket URL: </ticket/3467#comment:2>
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