[3.7] bpo-32826: Add "encoding=utf-8" to open() in idle_test/test_help_about. (GH-5639) #5642
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GUI test test_file_buttons() only looks at initial ascii-only lines,
but failed on systems where open() defaults to 'ascii' because
readline() internally reads and decodes far enough ahead to encounter
a non-ascii character in CREDITS.txt.
(cherry picked from commit f34e03e)
Co-authored-by: Terry Jan Reedy [email protected]
https://bugs.python.org/issue32826