When applying a normal amount of espresso, cane sugar, cocoa powder, and 
steamed milk to a Grml coffee cup, it will overflow. While this is not an 
exploitable bug, it can be pretty messy to clean up.

Futhermore (see attached screenshot, taken after freeing some of the buffer) 
junk data can be left on the outside, which reduces the drinking experience.

Proposed fix: enlarge the cup.