With CLIPPING disabled you should need a terminal or window with at
least 25 lines to change the 'statuslines' option from 2 to 3, but
it was being allowed on tty when there were only 24 lines available.
I think the other interfaces always have clipping capability enabled
so aren't affected.
Not many level maps extend to the bottom row (line 22 for a 1-based
count) so it wasn't likely to be noticed during play. That points
that maps which don't use all rows and/or all columns could get by
without clipping by adjusting their position. However, implementing
adaptive clipping is not something that I'm going to try to tackle.
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