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
/**
			 * The element change listener of the java outline viewer.
			 * @see IElementChangedListener
			 */
			class ElementChangedListener implements IElementChangedListener {
				
				public void elementChanged(final ElementChangedEvent e) {
					
					if (getControl() == null)
						return;
						
					Display d= getControl().getDisplay();
					if (d != null) {
						d.asyncExec(new Runnable() {
							public void run() {
								IJavaElementDelta delta= findElement( (ICompilationUnit) fInput, e.getDelta());
								if (delta != null && fOutlineViewer != null) {
									fOutlineViewer.reconcile(delta);
								}
							}
						});
					}
				}
				
				protected IJavaElementDelta findElement(ICompilationUnit unit, IJavaElementDelta delta) {
					
					if (delta == null || unit == null)