Bug 40788 [plan item] Configurable Next/Previous actions
Toolbar drop down, or editor specific control. Needs to be coordinated with Platform UI.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
/**
	 * Internal implementation class for a change listener.
	 * @since 3.0
	 */
	protected abstract class AbstractSelectionChangedListener implements ISelectionChangedListener  {