[issue39107] Upgrade tcl/tk to 8.6.10 (Windows and maxOS)

[Aivar Annamaa]

Aivar Annamaa <aivar.annamaa at gmail.com> added the comment:

According to the comments under https://github.com/python/cpython/pull/18982 there is no point in creating a PR, so I'll just share my experiences.

I was able to build current master with Tcl/Tk 8.6.10 both on Windows 10 (64-bit) and on macOS Catalina. I ran the tests on Windows and no Tkinter-related tests failed. I tested it manually on both platforms by poking around in IDLE and Thonny IDE and saw no (big) issues. (The only regression I saw in Thonny was Toplevel tooltips gaining a title bar, but I could solve it by adding a "wm_overrideredirect(1)"). 

One of the new features on macOS -- support for dark mode -- looked nice. Half-baked emoji support had not regressed at least.

I really hope you'll find time to include Tk 8.6.10 in the last beta of Python 3.9!

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