Function _isModifier

client/vendors/mousetrap.js:582–584

* determines if the keycode specified is a modifier key or not * * @param {string} key * @returns {boolean}

(key)

     * @returns {boolean}
     */
    function _isModifier(key) {
        return key == 'shift' || key == 'ctrl' || key == 'alt' || key == 'meta';
    }

    /**
     * called to set a 1 second timeout on the specified sequence