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/CompilationUnitDocumentProvider.java
import org.eclipse.jface.text.source.IAnnotationModelListener;
import org.eclipse.jface.text.source.IAnnotationModelListenerExtension;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.editors.text.FileDocumentProvider;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.texteditor.AbstractMarkerAnnotationModel;
import org.eclipse.ui.texteditor.MarkerAnnotation;
import org.eclipse.ui.texteditor.ResourceMarkerAnnotationModel;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.IProblemRequestor;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jdt.ui.text.JavaTextTools;
import org.eclipse.jdt.internal.ui.IJavaStatusConstants;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.JavaPluginImages;
import org.eclipse.jdt.internal.ui.JavaUIStatus;
import org.eclipse.jdt.internal.ui.text.IJavaPartitions;
import org.eclipse.jdt.internal.ui.text.correction.JavaCorrectionProcessor;
import org.eclipse.jdt.internal.ui.text.java.IProblemRequestorExtension;
public class CompilationUnitDocumentProvider extends FileDocumentProvider implements ICompilationUnitDocumentProvider {
		
		/**
		 * Here for visibility issues only.
		 */
		protected class _FileSynchronizer extends FileSynchronizer {