[3.7] bpo-38862: IDLE Strip Trailing Whitespace fixes end newlines (GH-17366) #17371
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Extra newlines are removed at the end of non-shell files. If the file only has newlines after stripping other trailing whitespace, all are removed, as is done by patchcheck.py.
(cherry picked from commit 6bf644e)
Co-authored-by: Terry Jan Reedy [email protected]
https://bugs.python.org/issue38862