ui.gadgets.panes: fix #1661.
ui.gadgets.panes: fix #1661.

Using old "split-lines" behavior that was needed by documents vocabulary,
rather than the new "string-lines" behavior that doesn't indicate if the
string is newline terminated.

tgunr/factor,AlexIljin/factor,mrjbq7/factor,factor/factor,tgunr/factor,AlexIljin/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bjourne/factor,bpollack/factor,mrjbq7/factor,AlexIljin/factor,tgunr/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,bjourne/factor,bpollack/factor,bjourne/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,mrjbq7/factor,tgunr/factor,factor/factor,bpollack/factor,tgunr/factor,AlexIljin/factor,bjourne/factor,factor/factor,bjourne/factor,bjourne/factor,bpollack/factor,factor/factor