When displaying a calculation taller than the screen, the output could
be displayed above the screen.
- type 1/2/3/4/5/6/7/8/9 (the main fraction between the 1 and 2)
- press UP to select the output
==> The output is still offscreen.
Change-Id: Ic3ed7664ae693d22486f8b2f9f3a8f2324c3d7c9