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
import org.eclipse.jdt.ui.actions.ShowActionGroup;
import org.eclipse.jdt.ui.text.JavaSourceViewerConfiguration;
import org.eclipse.jdt.ui.text.JavaTextTools;
import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.actions.CompositeActionGroup;
import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.GoToNextPreviousMemberAction;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.SelectionHistory;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.StructureSelectEnclosingAction;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.StructureSelectHistoryAction;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.StructureSelectNextAction;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.StructureSelectPreviousAction;
import org.eclipse.jdt.internal.ui.javaeditor.selectionactions.StructureSelectionAction;
import org.eclipse.jdt.internal.ui.text.HTMLTextPresenter;
import org.eclipse.jdt.internal.ui.text.IJavaPartitions;
import org.eclipse.jdt.internal.ui.text.JavaChangeHover;
import org.eclipse.jdt.internal.ui.text.JavaPairMatcher;
import org.eclipse.jdt.internal.ui.util.JavaUIHelp;
import org.eclipse.jdt.internal.ui.viewsupport.IViewPartInputProvider;
/**
 * Java specific text editor.
 */
public abstract class JavaEditor extends ExtendedTextEditor implements IViewPartInputProvider {
	
	/**
	 * Internal implementation class for a change listener.
	 * @since 3.0
	 */
	protected abstract class AbstractSelectionChangedListener implements ISelectionChangedListener  {