Backport PR #22002: Fix TkAgg memory leaks and test for memory growth regressions #22935
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FIX: TkAgg memory leaks and test for memory growth regressions (#22002)
tkinter variables get cleaned up with normal
destroy
andgc
semantics but tkinter's implementation of trace is effectively global and keeps the callback object alive until the trace is removed.Additionally extend and clean up the tests.
Closes #20490
Co-authored-by: Elliott Sales de Andrade [email protected]
(cherry picked from commit 1a016f0)