137     if (curwin->w_lines_valid == 0 && type < NOT_VALID  in update_screen()
151 	    curwin->w_lines_valid = 0;	// don't use w_lines[].wl_size now  in update_screen()
187 			    && wp->w_lines_valid > 0  in update_screen()
1500 	wp->w_lines_valid = 0;  in win_update()
1633 	    for (i = 0; i < wp->w_lines_valid; ++i)  in win_update()
1688 	for (i = 0; i < wp->w_lines_valid; ++i)  in win_update()
1779 			if (wp->w_lines_valid != 0)  in win_update()
1788 			    if ((wp->w_lines_valid += j) > wp->w_height)  in win_update()
1789 				wp->w_lines_valid = wp->w_height;  in win_update()
1790 			    for (idx = wp->w_lines_valid; idx - j >= 0; idx--)  in win_update()
1814 	    for (i = 0; i < wp->w_lines_valid; i++)  in win_update()
1853 		if ((row == 0 || bot_start < 999) && wp->w_lines_valid != 0)  in win_update()
1869 			    wp->w_lines_valid = idx + 1;  in win_update()
1875 			if (++j >= wp->w_lines_valid)  in win_update()
1877 			    wp->w_lines_valid = idx;  in win_update()
2108 	    while (lnum < from && idx < wp->w_lines_valid)	// find start  in win_update()
2116 		if (idx < wp->w_lines_valid && wp->w_lines[idx].wl_valid)  in win_update()
2124 	    for ( ; idx < wp->w_lines_valid; ++idx)		// find end  in win_update()
2213 		|| idx >= wp->w_lines_valid  in win_update()
2266 		for (i = idx; i < wp->w_lines_valid; ++i)  in win_update()
2281 			while (i < wp->w_lines_valid  in win_update()
2289 		if (i >= wp->w_lines_valid)  in win_update()
2376 				if (i >= wp->w_lines_valid)  in win_update()
2378 				    wp->w_lines_valid = j;  in win_update()
2386 				    wp->w_lines_valid = j + 1;  in win_update()
2399 			    wp->w_lines_valid += j;  in win_update()
2400 			    if (wp->w_lines_valid > wp->w_height)  in win_update()
2401 				wp->w_lines_valid = wp->w_height;  in win_update()
2402 			    for (i = wp->w_lines_valid; i - j >= idx; --i)  in win_update()
2436 	    if (idx < wp->w_lines_valid  in win_update()
2558     if (idx > wp->w_lines_valid)  in win_update()
2559 	wp->w_lines_valid = idx;  in win_update()
3096 	    wp->w_lines_valid = 0;  in redraw_win_later()