Bug 17292 Inconsistent Undo behaviour for Cut/Copy/Paste in outline
Build 20020521 (freeze 1) 1) Open a java editor on some class 2) In the content outline, select a method and do Ctrl+X to cut 3) Notice in the menus, Edit->Undo and Refactor->Undo are disabled 4) Now select the type node in the content outline, and Ctrl+V to paste 5) Still, neither Undo action is enabled 6) Now click inside the editor area to give it focus. 7) Now "Edit->Undo" is possible. So, the problems are: 1) Undo is not consistent, it's available for Paste but not Cut. 2) Even when undo is possible, it only becomes enabled when the editor is activated.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
super(tree);
					setAutoExpandLevel(ALL_LEVELS);
				}
				
				/**
				 * Investigates the given element change event and if affected incrementally
				 * updates the outline.
				 */
				public void reconcile(IJavaElementDelta delta) {
					if (getSorter() == null) {
						Widget w= findItem(fInput);
						if (w != null && !w.isDisposed())
							update(w, delta);
					} else {
						
						refresh();
					}
				}
				
				/*
				 * @see TreeViewer#internalExpandToLevel
				 */
				protected void internalExpandToLevel(Widget node, int level) {
					if (node instanceof Item) {
						Item i= (Item) node;
						if (i.getData() instanceof IJavaElement) {
							IJavaElement je= (IJavaElement) i.getData();
							if (je.getElementType() == IJavaElement.IMPORT_CONTAINER || isInnerType(je)) {
								if (i != fReusedExpandedItem) {
									setExpanded(i, false);