[3.13] gh-124111: Update tkinter for compatibility with Tcl/Tk 9.0.0 (GH-124156) by vstinner · Pull Request #127364 · python/cpython
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Maybe a review from someone who's not a tk expert at all would still be helpful?
Most of the PR is changes to tests, which look reasonable, and should still do their job after this reorganization.
I added comments for the two behaviour changes.
I can't comment on Windows packaging. Unfortunately, @zooba's review on the original PR looks unfinished.