Changes

== Alignment Rects ==

When working with constraints it is important to be aware that constraints operate on the content of a view, not the frame in which a view is displayed. This content is referred to as the alignment rect of the view. Alignment constraints such as those that cause the center of one view to align with that of another will do so based on the alignment rects of the views, disregarding any padding that may have been configured for the frame of the view.