[issue34120] IDLE: Freeze when closing Settings (& About) dialog on MacOS

[Tal Einat]

Tal Einat <taleinat at gmail.com> added the comment:

Adding grab_release() calls also resolves the issue. Tested on mac and win.

PR updated with this approach, IMO ready for review.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34120>
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