Remember screen size settings per layout in the designer

RELEASED: Web 5.15

When loading a viewer in the designer, the default view is always Desktop (i.e. the left-most of the three icons). When switching to a different layout, I need to manually select a different screen size and orientation to match the selected layout.

It would be nice if either the last selected screen size (per layout) would be remembered for the next browser session, or if we could set one 'preferred' screen setting for each layout