Symbol: GRID_LINE_SECOND_PROMPT
usr.bin/tmux/grid.c
1696
if (flags & GRID_LINE_SECOND_PROMPT)
usr.bin/tmux/input.c
3258
gl->flags |= GRID_LINE_SECOND_PROMPT;
usr.bin/tmux/tmux.h
812
GRID_LINE_SECOND_PROMPT| \