This is looking for

a) `<textarea>` in `form.wysiwyg` and
b) `textarea.wysiwyg` in any `<form>`.

Before this could be done in one call. Now there's the `el` parameter, which is usually the part of the DOM that was added in which widgets have to be initialized.

I can search `textarea.wysiwyg` directly in `el`, which is the second line. I cannot search `form.wysiwyg` inside `el` because the `<form>` element might be (and usually is for dynamic formsets) outside `el`. That's why there's now two calls where there was one.