F dropdown

Summary

"Fix" for #292 (closed)

Focus

The actual bug seems to be in the bootstrap-select library, which may be misusing the bootstrap 5 API. We cannot fix it easily, so we just ignore the error for now.

Also, I update bootstrap to the latest 5.2

Test Environment

Please also test this branch manually. Since #285 (closed) is yet unresolved, you might want to use the web console to make the dropdown menu visible by adding static height to the property line in the edit mode.

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