isActive(section_id) {
		const field = this.map.findElement('data-field', this.cbid(section_id));
		return (field != null && !field.classList.contains('hidden'));
	}
Test whether the option element is currently active.

An element is active when it is not hidden due to unsatisfied dependency
constraints.

@param {string} section_id
The configuration section ID

@returns {boolean}
Returns `true` if the option element currently is active, otherwise it
returns `false`.