New: Add "is-selected" class if an option has been selected (fixes #178…

…) (fixes #179)

* Add is-selected class if an option has been selected

* Implement hasActiveOption

templates/matchingDropDown.jsx

@@ -164,14 +164,17 @@ export default function MatchingDropDown(props) {
     ? correctActiveOption
     : activeOption;
 
+  const hasActiveOption = Boolean(options.find(option => (option._itemIndex === _itemIndex) && option._isActive));
+
   return (
     <div className="dropdown" disabled={!_isEnabled}>
 
       <button
         disabled={!_isEnabled}
         className={classes([
           'dropdown__btn js-dropdown-btn',
-          !_isEnabled && 'is-disabled'
+          !_isEnabled && 'is-disabled',
+          hasActiveOption && 'is-selected'
         ])}
         aria-haspopup="listbox"
         aria-expanded={isOpen}