split across lines cause POSIX/Bash compliance

Joel Grunbaum

2020-10-16 4757e94c28064b07a52aa2138927315fe3e0941c

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extra-keys = [ \
 ['ESC','|','/','HOME','UP','END','-','DEL'], \
 ['TAB','CTRL','ALT','LEFT','DOWN','RIGHT','_','BKSP'] \
]