Show mixed content movies and shows vertical posters not horizontal

[TheDreadPirate]

The "recently added" view uses the image labeled as "primary" for each entry. For movies and shows libraries the "primary" images are pretty much always vertical posters. For mixed libaries the "primary" image is almost always horizontal.

If you were to set the primary image for all the entries in your mixed library to a vertical image it should show that vertical image in "recently added".