Parent tk StringVar to the canvas widget, not to the toolbar. #28077
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... because the toolbar may be a fake object (when using rcParams["toolbar"] = "toolmanager").
Try with
rcParams["toolbar"] = "toolmanager; use("tkagg")
and interactively saving the picture. No automated tests, sorry.Closes #28069 (I chose not to parent to None as suggested in the original issue because I'm not 100% sure this won't lead to variables being progressively leaked into tk's global namespace.)
Looks like a regression in 3.8 (#24531), so let's try to get this in 3.9.
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