public void firePropertyChanged(String propertyName, Object oldValue, Object newValue) {
		if (Objects.equals(oldValue, newValue)) {
			return;
		}
		PropertyChangeEvent event = new PropertyChangeEvent(this, propertyName, oldValue, newValue);
		for (PropertyChangeListener listener : propertyListeners) {
			listener.propertyChange(event);
		}
	}
Cleans up any resources used by the action.
Ghidra/Framework/Docking/src/main/java/docking/action/DockingAction.java