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
public _FileSynchronizer(IFileEditorInput fileEditorInput) {
				super(fileEditorInput);
			}
		};
		
		/**
		 * Bundle of all required informations to allow working copy management. 
		 */
		protected class CompilationUnitInfo extends FileInfo {
			
			ICompilationUnit fCopy;
			
			CompilationUnitInfo(IDocument document, IAnnotationModel model, _FileSynchronizer fileSynchronizer, ICompilationUnit copy) {
				super(document, model, fileSynchronizer);
				fCopy= copy;
			}
			
			void setModificationStamp(long timeStamp) {
				fModificationStamp= timeStamp;
			}
		};
		
		/**
		 * Annotation representating an <code>IProblem</code>.
		 */
		static protected class ProblemAnnotation extends Annotation implements IProblemAnnotation {