We ensure that selectable lines are placed at the same vertical
coordinates but space out unselectable text lines at the cost
of reduced heigh of empty space between the store items.
We also have to move the back button in scrollable lists to the
lower right.
This can definitely be improved further but at least it solves
the problem for now.
Refs #3162
Gleb Mazovetskiy
Anders Jenbo
John Törnblom