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 void put(Position position,  Object value) {
				int index= getIndex(position);
				if (index == -1) {
					Entry entry= new Entry();
					entry.fPosition= position;
					entry.fValue= value;
					fList.add(entry);
				} else {
					Entry entry= (Entry) fList.get(index);
					entry.fValue= value;
				}
			}
			
			public void remove(Position position) {
				int index= getIndex(position);
				if (index > -1)
					fList.remove(index);
			}
			
			public void clear() {
				fList.clear();
			}
		};
		
		/**
		 * Annotation model dealing with java marker annotations and temporary problems.
		 * Also acts as problem requestor for its compilation unit. Initialiy inactive. Must explicitly be
		 * activated.
		 */
		protected class CompilationUnitAnnotationModel extends ResourceMarkerAnnotationModel implements IProblemRequestor, IProblemRequestorExtension {