[Bugs] #4512 Read UNSP: Read can't open txt files

[Sugar Labs Bugs]

#4512: Read can't open txt files
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    Reporter:  godiard                    |          Owner:  godiard                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Read                       |        Version:  0.98.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Something in the text view api has changed:

 {{{

   File "/home/gonzalo/Activities/Read.activity/readactivity.py", line 689,
 in read_file
     self._load_document('file://' + self._tempfile)
   File "/home/gonzalo/Activities/Read.activity/readactivity.py", line 864,
 in _load_document
     self._view.setup(self)
   File "/home/gonzalo/Activities/Read.activity/textadapter.py", line 91,
 in setup
     self.highlight_tag.set_property('underline', 'single')
 ValueError: invalid literal for int() with base 10: 'single'
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4512>
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