Peter Wilson 3965584a04 Taxonomy: Fix warnings thrown by custom term count callbacks.
Add a `use` to a closure to avoid an undefined variable throwing a warning. Adds unit tests to ensure the custom callbacks run as expected when defined.

Follow up to [49141].
Props ocean90, dd32.
Fixes #40351.



git-svn-id: https://develop.svn.wordpress.org/trunk@49171 602fd350-edb4-49c9-b593-d223f7449a82
2020-10-16 02:41:15 +00:00
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2020-06-26 13:31:11 +00:00