Issue #3512816 by kevin-oyster, juandhr: Replace jQuery.isFunction, removed in jQuery 4.0+ (!610) · Merge requests · project / webform

Replace $.isFunction(jQuery.fn.valid) with (typeof jQuery.fn.valid === "function") in /js/webform.form.submit_once.js on line 47.

Issue #3512816 by kevin-oyster, juandhr: Replace jQuery.isFunction, removed in jQuery 4.0+