Overriding traits with embedded UINavigationController

In Rigelian the album view comes in 2 flavours: a wide display for the iPad, and a narrow version for the iPhone. The view controller is based on a single nib file, with constraints specific for the horizontal size classes .regular and .compact. While implementing a 3-column layout for artists, it turned out that the remaining space for the album view becomes too narrow for the wide display, resulting in many song titles being shortened. So I want to show the narrow version of the screen, like shown here: But the UINavigationController and its child controllers report the horizontal size […]