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
IStatusLineManager statusLineManager= site.getActionBars().getStatusLineManager();
		if (statusLineManager != null) {
			StatusBarUpdater updater= new StatusBarUpdater(statusLineManager);
			fOutlineViewer.addSelectionChangedListener(updater);
		}
		
		registerToolbarActions();
				
		fOutlineViewer.setInput(fInput);	
		fOutlineViewer.getControl().addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent e) {
				handleKeyReleased(e);
			}
		});
		
		initDragAndDrop();
	}
	public void dispose() {
		
		if (fEditor == null)
			return;
			
		fEditor.outlinePageClosed();
		fEditor= null;
		
		Object[] listeners= fSelectionChangedListeners.getListeners();
		for (int i= 0; i < listeners.length; i++)
			fSelectionChangedListeners.remove(listeners[i]);
		fSelectionChangedListeners= null;