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
protected boolean mustUpdateParent(IJavaElementDelta delta, IJavaElement element) {
					if (element instanceof IMethod) {
						if ((delta.getKind() & IJavaElementDelta.ADDED) != 0) {
							try {
								return ((IMethod)element).isMainMethod();
							} catch (JavaModelException e) {
								JavaPlugin.log(e.getStatus());
							}
						}
						return "main".equals(element.getElementName()); 
					}
					return false;
				}
				
				protected ISourceRange getSourceRange(IJavaElement element) throws JavaModelException {
					if (element instanceof IMember)
						return ((IMember) element).getNameRange();
					if (element instanceof ISourceReference)
						return ((ISourceReference) element).getSourceRange();
					return null;
				}
				
				protected boolean overlaps(ISourceRange range, int start, int end) {
					return start <= (range.getOffset() + range.getLength() - 1) && range.getOffset() <= end;
				}
				
				protected boolean filtered(IJavaElement parent, IJavaElement child) {
					
					Object[] result= new Object[] { child };