[issue27922] Make IDLE tests less flashy

[Terry J. Reedy]

Terry J. Reedy added the comment:

This is also a follow-up to #27918.  Importing test.support causes a flash in the process of testing whether tkinter/tk work.  So I was never able to get IDLE tests to completely stop flashing. Adding 'root.withdraw' to test.support.__init__ solves the import flash, and with that fix, individual IDLE tests and test_idle no longer flash.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27922>
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