public void OnChange()
{
var newDynamicTree = diffApplier.ToDynamic(worldTreeService.EditingWorld);
// todo: initialize this
previousDynamicTree = previousDynamicTree ?? newDynamicTree;
var diff = diffBuilder.BuildDiffs(previousDynamicTree, newDynamicTree, diffIdentityComparer);
if (diff.IsEmpty)
{
return;
}
var undoable = new DiffUndoable(diffApplier, worldTreeService.EditingWorld, diff);
undoStack.Push(undoable);
redoStack.Clear();
previousDynamicTree = newDynamicTree;
NotifyObserver();
}
