Bug 19014 Empty CU after reorg
F2 - enable single click and show in members in packages view - open TestCase.java in editor - give focus to packages view - change it on disk - copy a method in TestCase using DnD - activate the TestCase.java editor - answer question with no - activate revert from context menu observe: CU is empty
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitDocumentProvider.java
private List fOverlaids;
			private IProblem fProblem;
			private Image fImage;
			private static Image fgImage;
			
			public ProblemAnnotation(IProblem problem) {
				fProblem= problem;
				setLayer(MarkerAnnotation.PROBLEM_LAYER + 1);
				
				if (fgImage == null)
					fgImage= JavaPluginImages.get(JavaPluginImages.IMG_OBJS_FIXABLE_PROBLEM);
				
				if (JavaEditorPreferencePage.showTempProblems() && JavaCorrectionProcessor.hasCorrections(fProblem.getID()))
					fImage= fgImage;
			}
						
			/*
			 * @see Annotation#paint
			 */
			public void paint(GC gc, Canvas canvas, Rectangle r) {
				if (fImage != null)
					drawImage(fImage, gc, canvas, r, SWT.CENTER, SWT.CENTER);
			}