[Pidgin] #6089: Crash while trying to copy text out of the debug window

[Pidgin]

#6089: Crash while trying to copy text out of the debug window
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 Reporter:  dave1g           |        Owner:              
     Type:  defect           |       Status:  new         
Milestone:                   |    Component:  pidgin (gtk)
  Version:  2.5.4            |   Resolution:              
 Keywords:  debug crash log  |  
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Comment(by taralluccio):

 After some inspections, the crash seem to happen when
 `gtk_text_iter_make_surreal` returns `NULL` because the text buffer
 iterator is invalid.

 It looks like that, somehow, `gtk_imhtml_get_markup_range` passes an
 invalid `GtkTextIterator` to `gtk_text_iter_forward_char` (in the call to
 {{{gtk_text_iter_forward_char(&iter)}}} placed near the end of the
 function).

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Ticket URL: <http://developer.pidgin.im/ticket/6089#comment:9>
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