* The WordCounter should only do one thing: count words. This makes it also easier to test.
* Add some really basic unit tests.
* Instead of only refreshing the count on enter and delete, refresh the count when the user stops typing. Also look at paste and content changes in TinyMCE.
* Use `match` instead of `replace` when it is appropriate.
* More readable code.
See #30966. Fixes#26620.
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