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
event= new LabelProviderChangedEvent((IBaseLabelProvider) event.getSource());
									break;
								}
							}
						}
					}
					super.handleLabelProviderChanged(event);
				}
				
				private IResource getUnderlyingResource() {
					Object input= getInput();
					if (input instanceof ICompilationUnit) {
						ICompilationUnit cu= (ICompilationUnit) input;
						if (cu.isWorkingCopy()) {
							return cu.getOriginalElement().getResource();
						} else {
							return cu.getResource();
						}				
					} else if (input instanceof IClassFile) {
						return ((IClassFile) input).getResource();
					}
					return null;
				}				
				
			};
				
			class LexicalSortingAction extends Action {
				
				private JavaElementSorter fSorter= new JavaElementSorter();