David Taylor 87b98e2862
FIX: Ensure category/tag classes are added and removed correctly (#16003)
The use of a `/g` regex was causing some surprising, seemingly random, behavior. (https://stackoverflow.com/a/1520853/5913559)

There was also a known issue which would cause inconsistent class behavior when running the 'loading slider' theme component.

This commit takes the opportunity to refactor the component to remove the use of observers and remove the regex-based class parsing.
2022-02-21 09:42:39 +00:00
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