[issue30642] Fix leaks in idlelib

[Terry J. Reedy]

Terry J. Reedy added the comment:

f:\dev\36>python -m test -R: -ugui test_idle
gives about 40 invoke event messages, but the test passes.  So the messages and leaks are not connected.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30642>
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