SHIFT_SIZE
#define LINE_START (rounddown(-MAX_CHARS - 1, SHIFT_SIZE) - SHIFT_SIZE)
int count = get_shift(line->shift_count) * -SHIFT_SIZE;
int cnt = get_shift(line->shift_count) * -SHIFT_SIZE;
shift = (new_x - XBREAK) / SHIFT_SIZE + 1;
shift = new_x / SHIFT_SIZE;
if (new_x % SHIFT_SIZE)
int nx = get_shift(line->shift_count) * -SHIFT_SIZE;
int tx = get_shift(line->shift_count) * -SHIFT_SIZE;
shift = (XBREAK - count_chars(start_line)) / SHIFT_SIZE;
nx += shift * SHIFT_SIZE;/* Reset x value */