Bug 40785 [plan item] Overview ruler improvements
- navigation from ruler to editor - hovering over header area shows number of errors/warning (header annotations in general)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
protected JavaOutlinePage fOutlinePage;
	
	protected String fOutlinerContextMenuId;
	/**
	 * The editor selection changed listener.
	 * 
	 * @since 3.0
	 */
	private EditorSelectionChangedListener fEditorSelectionChangedListener;
	
	protected AbstractSelectionChangedListener fOutlineSelectionChangedListener= new OutlineSelectionChangedListener();
	
	protected JavaPairMatcher fBracketMatcher= new JavaPairMatcher(BRACKETS);
	
	private MouseClickListener fMouseListener;
	
	private InformationPresenter fInformationPresenter;
	
	private SelectionHistory fSelectionHistory;
	
	private org.eclipse.core.runtime.Preferences.IPropertyChangeListener fPropertyChangeListener= new PropertyChangeListener();
	
	protected CompositeActionGroup fActionGroups;
	private CompositeActionGroup fContextMenuGroup;
		
	/**
	 * Returns the most narrow java element including the given offset.
	 * 
	 * @param offset the offset inside of the requested element
	 * @return the most narrow java element