[whatwg] Fixing undo on the Web - UndoManager and Transaction

[Jonas Sicking]

On Thu, Sep 1, 2011 at 6:26 AM, Alex Vincent <ajvincent at gmail.com> wrote:
>   3. I just spotted a flaw in our API's.  Imagine the following:
>      -
>
>      myEditor.undoManager.transact({apply: function () {
> insert(document.createTextNode('o')) }, label: 'First transaction'});
>      myEditor.undoManager.transact({apply: function () {
> insert(document.createTextNode('k')) }, label: 'Merging transaction'},
> true);
>
>      - User calls myEditor.undoManager.item(0).label.  Which label does he
>      get back?  For that matter, which transaction does he get back, and which
>      transaction is forever hidden from him?
>      - Perhaps for this reason, .item() should return a readonly
>      Transaction[], representing the transaction group.

That's what we've been thinking for the Firefox implementation. It's
not a great solution though, but I can't think of a better one.

/ Jonas