[3.10] gh-97527: IDLE: protect macosx Tk() call when no GUI (GH-97530) #97532
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Only call tkinter.tk and its follow-up code in _init_tk_type when requires('gui')
does not raise. This function can be called as an unintended side-effect of
calling other idlelib code as part of tests on macOS without a GUI enabled.
(cherry picked from commit 9704f8d)
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu