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
/*
			 * @see IProblemAnnotation#getImage(Display)
			 */
			public Image getImage(Display display) {
				return fImage;
			}
			
			/*
			 * @see IProblemAnnotation#getMessage()
			 */
			public String getMessage() {
				return fProblem.getMessage();
			}
			/*
			 * @see IProblemAnnotation#isTemporaryProblem()
			 */
			public boolean isTemporaryProblem() {
				return true;
			}
			/*
			 * @see IProblemAnnotation#isWarning()
			 */
			public boolean isWarning() {
				return fProblem.isWarning();
			}
			/*
			 * @see IProblemAnnotation#isError()
			 */
			public boolean isError() {
				return fProblem.isError();