UnicodeDecodeError when find encounters a non-ascii file

[Curtis Hovey]

Wile search for text in a firectory with utf-8 files, this error was seen.

Traceback (most recent call last):
  File "/usr/lib/python3.3/threading.py", line 637, in _bootstrap_inner
    self.run()
  File "/home/curtis/.local/share/gedit/plugins/gdp/find.py", line 143, in run
    self.pattern, substitution=self.substitution):
  File "/home/curtis/.local/share/gedit/plugins/gdp/find.py", line 55, in find_matches
    file_path, match_re, substitution=substitution)
  File "/home/curtis/.local/share/gedit/plugins/gdp/find.py", line 85, in extract_match
    for lineno, line in enumerate(file_):
  File "/usr/lib/python3.3/codecs.py", line 300, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc2 in position 83: invalid continuation byte

Each file is opened as text, but the encoding is not specified. This looks like the utf-8 file is being decoded as ascii. the simple fix is to open the file as utf-8. There is an important nuance with unsupported characters though....substitute needs to know the correct number of characters when replacing text in a line. The 'replace' option is the safest means to handle errors so ensure files are not corrupted.