[ttFont] fixes xmlWriter import error in _saveXML method with ttx split tables request #1189
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Issue report: #1188
Closes #1188
Recognized in fontTools version 3.22.0 (PyPI release) with Python 3.6.4 interpreter
Problem: Attempt to dump split OT tables with ttx leads to NameError. This PR moves the xmlWriter import from within the public
saveXML
method to the top of the ttFont module.Replicated and confirmed test failure with this test:
https://github.com/chrissimpkins/fonttools/blob/88b0446d066ee72ad70eb41b382d184875c2fcbd/Tests/xmlwriter_test.py#L1-L14
and left this in a separate branch because I don't know how you are testing your ttx dumps to contribute it here. Can confirm that it fails before this change and does not fail after the change.