Don't assume tk canvas have a manager attached. #14568
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dstansby
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I just tripped over this myself. |
efiring
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…568-on-v3.1.x Backport PR #14568 on branch v3.1.x (Don't assume tk canvas have a manager attached.)
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PR Summary
Closes #1219 (specifically #1219 (comment)).
Release critical, because a regression.
PR Checklist