936: Mainline

A review of the diagrams in Segment 926, Segment 933, and Segment 935 suggests that the form view could initiate an endless loop. It does not, for two reasons:

• The firePropertyChange method does not activate listeners if the old value and new value are the same.
• The setters defined in the movie model, in Segment 768, do not activate observers if the old value and the new value are the same.