vimrc: Use Gundo when -python3 and Undotree when +python3

I got this error today when opening Gundo:

    "__Gundo__" [New File]
    Error detected while processing function gundo#GundoToggle[1]..<SNR>102_GundoToggle[6]..<SNR>102_GundoOpen[31]..<SNR>102_GundoRenderPreview:
    line    2:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "HOME/.vim/bundle/gundo/autoload/gundo.py", line 474, in GundoRenderPreview
        _output_preview_text(_generate_preview_diff(current, node_before, node_after))
      File "HOME/.vim/bundle/gundo/autoload/gundo.py", line 382, in _generate_preview_diff
        before_time, after_time))
      File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/difflib.py", line 1177, in unified_diff
        _check_types(a, b, fromfile, tofile, fromfiledate, tofiledate, lineterm)
      File "/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/difflib.py", line 1312, in _check_types
        raise TypeError('all arguments must be str, not: %r' % (arg,))
    TypeError: all arguments must be str, not: 74

Didn't really want to bother investigating, so I tried Undotree and it
worked. Since I have different Vims on different machines, keep Gundo as
before, but use Undotree instead when compiled with +python3.

0 files changed, 0 insertions, 0 deletions