Changes for 1.5.3
- The transaction name argument to UndoManager.commitTransaction (or Model.commitTransaction or Diagram.commitTransaction) is now optional, and defaults to the name given at the time of the call to UndoManager.startTransaction.
- The Backspace (Windows) or Delete (Mac) key now invokes CommandHandler.deleteSelection just like the Delete (Windows) or Delete-Forward (Mac) key already does.