bounds = calculate_display_line_boundaries (w, bflag);
XSETWINDOW (window, w);
if (window_is_leftmost (w))
redisplay_clear_region (window, DEFAULT_INDEX, FRAME_LEFT_BORDER_START (f),
ypos1, FRAME_BORDER_WIDTH (f), height);
bounds = calculate_display_line_boundaries (w, bflag);
XSETWINDOW (window, w);
if (window_is_leftmost (w))
redisplay_clear_region (window, DEFAULT_INDEX, FRAME_LEFT_BORDER_START (f),
ypos1, FRAME_BORDER_WIDTH (f), height);