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 IDocumentExtension#startSequentialRewrite(boolean)
			 */
			synchronized public void startSequentialRewrite(boolean normalized) {
				super.startSequentialRewrite(normalized);
		}
		
			/*
			 * @see IDocumentExtension#stopSequentialRewrite()
			 */
			synchronized public void stopSequentialRewrite() {
				super.stopSequentialRewrite();
			}
			
			/*
			 * @see IDocument#get()
			 */
			synchronized public String get() {
				return super.get();
			}
			
			/*
			 * @see IDocument#get(int, int)
			 */
			synchronized public String get(int offset, int length) throws BadLocationException {
				return super.get(offset, length);
			}