[issue21933] Allow the user to change font sizes with the text pane of turtledemo

[Terry J. Reedy]

Terry J. Reedy added the comment:

While we are at it, lets compute "sys.platform == 'darwin'" just once and use conditional expressions.  (I just condensed config_gui() with conditional expressions, but avoided changing the context for the patches here.)

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Added file: http://bugs.python.org/file36126/tdemo-font-34-t2.diff

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<http://bugs.python.org/issue21933>
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