Bug 28582 Quickfix icon hides the error icon in editor left ruler [quick fix]
Build 20021216 In presence of problems, one cannot see an error icon in the left ruler, since it get overlapped completely with the quickfix icon. The only error indication is the underlining in the code itself.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitDocumentProvider.java
public IResource getUnderlyingResource(Object element) {
		if (element instanceof IFileEditorInput) {
			IFileEditorInput input= (IFileEditorInput) element;
			return input.getFile();
		}
		return null;
	}
	
	/*
	 * @see IWorkingCopyManager#connect(IEditorInput)
	 */
	public void connect(IEditorInput input) throws CoreException {
		super.connect(input);
	}
	
	/*
	 * @see IWorkingCopyManager#disconnect(IEditorInput)
	 */
	public void disconnect(IEditorInput input) {
		super.disconnect(input);
	}
	
	/*
	 * @see IWorkingCopyManager#getWorkingCopy(Object)
	 */
	public ICompilationUnit getWorkingCopy(IEditorInput element) {
		
		ElementInfo elementInfo= getElementInfo(element);		
		if (elementInfo instanceof CompilationUnitInfo) {
			CompilationUnitInfo info= (CompilationUnitInfo) elementInfo;