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
return;
								}
							}
						}
					}
					super.internalExpandToLevel(node, level);
				}
								
				protected void reuseTreeItem(Item item, Object element) {
					
					
					Item[] c= getChildren(item);
					if (c != null && c.length > 0) {
						
						if (getExpanded(item))
							fReusedExpandedItem= item;
						
						for (int k= 0; k < c.length; k++) {
							if (c[k].getData() != null)
								disassociate(c[k]);
							c[k].dispose();
						}
					}
					
					updateItem(item, element);
					updatePlus(item, element);					
					internalExpandToLevel(item, ALL_LEVELS);
					
					fReusedExpandedItem= null;
				}