[issue41176] revise Tkinter mainloop dispatching flag behavior

[E. Paine]

E. Paine <paineelisha at gmail.com> added the comment:

I have just finished reviewing the proposed PR, and am happy with the content. During the process of developing the PR, we established that the behaviour that should be deprecated is the error after a second of waiting in a thread. Instead, on `WaitForMainloop` removal, we should pass straight through and use the tcl queue to wait for mainloop.

@Serhiy, is waiting for the tcl queue acceptable behaviour? It seemed to behave correctly during my tests and if it is acceptable, both me and Richard would really appreciate your review of the PR.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41176>
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