hideModal() {
		document.body.classList.remove('modal-overlay-active');
		modalDiv.blur();
	}
Close the open modal overlay dialog.

This function will close an open modal dialog and restore the normal view
behaviour. It has no effect if no modal dialog is currently open.

Note that this function is stand-alone, it does not rely on `this` and
will not invoke other class functions so it is suitable to be used as event
handler as-is without the need to bind it first.