[issue38862] IDLE: Include end newlines in whitespace fix.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

patchcheck.py removes even a single newline if that is all that remains after stripping each line.  So the revised rule is that a file should be either empty or end with a non-whitespace followed by a newline.  My intent is that a file be ready to merge to out github python/cpython repository.

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<https://bugs.python.org/issue38862>
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