Insert(a1):Insert(a2) Hidden(a1):Viewable(a2)
- foobar_a2 should be directly to the left of artist
- foobar_a1 should be directly to the left of foobar_a2
- both foobar_a1 and foobar_a2 should be in the column picker for this page
- only foobar_a2 should be in the column picker for the main library (requires reload)
- all columns should be resizable