Vim: remap <Up>, <Down> as well when in "plaintext" mode
Vim: remap <Up>, <Down> as well when in "plaintext" mode

Given the new layered keyboard config, I may be using cursor keys a bit
more than before.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent