Add 'Fit to Sibling' next to 'Fit to Parent' for deformers.

Great that we now have the 'Fit to Parent', to instantly let deformers take over the size of the object to be deformed. But this only works when the Deformer is a child of the object.
Deformers also do their jobs when at the same level as the object to be deformed.
Please add this functionality to the Fit button. Just call it 'Fit', or add a 'Fit to Sibling' button.