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
public LexicalSortingAction() {
					super();
					
					setText(JavaEditorMessages.getString("JavaOutlinePage.Sort.label")); 
					JavaPluginImages.setLocalImageDescriptors(this, "alphab_sort_co.gif"); 
					setToolTipText(JavaEditorMessages.getString("JavaOutlinePage.Sort.tooltip")); 
					setDescription(JavaEditorMessages.getString("JavaOutlinePage.Sort.description")); 
					
					boolean checked= JavaPlugin.getDefault().getPreferenceStore().getBoolean("LexicalSortingAction.isChecked"); 
					valueChanged(checked, false);
				}
				
				public void run() {
					valueChanged(isChecked(), true);
				}
				
				private void valueChanged(boolean on, boolean store) {
					setChecked(on);
					fOutlineViewer.setSorter(on ? fSorter : null);
										
					if (store)
						JavaPlugin.getDefault().getPreferenceStore().setValue("LexicalSortingAction.isChecked", on); 
				}
			};
			
	private IJavaElement fInput;
	private String fContextMenuID;
	private Menu fMenu;
	private JavaOutlineViewer fOutlineViewer;
	private JavaEditor fEditor;