Use lambdas to prevent gc'ing and deduplication of widget callbacks. #18923
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This makes the behavior of widget callbacks more consistent with the old behavior (of using strong refs), and also more consistent with other widgets which don't rely on CallbackRegistry at all, such as SpanSelector and Lasso.
tacaswell
approved these changes
Nov 10, 2020
QuLogic
approved these changes
Nov 11, 2020
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This makes the behavior of widget callbacks more consistent with the old
behavior (of using strong refs), and also more consistent with other
widgets which don't rely on CallbackRegistry at all, such as
SpanSelector and Lasso.
See #18226 (comment).
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PR Checklist
pytestpasses).flake8on changed files to check).flake8-docstringsand runflake8 --docstring-convention=all).doc/users/next_whats_new/(follow instructions in README.rst there).doc/api/next_api_changes/(follow instructions in README.rst there).