328 		lineoff_T	loff;  in update_topline()  local
334 		loff.lnum = curwin->w_cursor.lnum;  in update_topline()
337 		(void)hasFolding(loff.lnum, NULL, &loff.lnum);  in update_topline()
340 		loff.fill = 0;  in update_topline()
343 		loff.height = 0;  in update_topline()
344 		while (loff.lnum < curwin->w_botline  in update_topline()
346 			&& (loff.lnum + 1 < curwin->w_botline || loff.fill == 0)  in update_topline()
350 		    n += loff.height;  in update_topline()
353 		    botline_forw(&loff);  in update_topline()
440     lineoff_T	loff;  in check_top_offset()  local
450 	loff.lnum = curwin->w_cursor.lnum;  in check_top_offset()
452 	loff.fill = 0;  in check_top_offset()
460 	    topline_back(&loff);  in check_top_offset()
462 	    if (loff.lnum < curwin->w_topline  in check_top_offset()
464 		    || (loff.lnum == curwin->w_topline && loff.fill > 0)  in check_top_offset()
468 	    n += loff.height;  in check_top_offset()
1958     lineoff_T	loff;  in scroll_cursor_bot()  local
1976 	loff.fill = 0;  in scroll_cursor_bot()
1980 		curwin->w_topline = loff.lnum)  in scroll_cursor_bot()
1982 	    loff.lnum = curwin->w_topline;  in scroll_cursor_bot()
1983 	    topline_back(&loff);  in scroll_cursor_bot()
1984 	    if (loff.height == MAXCOL || used + loff.height > curwin->w_height)  in scroll_cursor_bot()
1986 	    used += loff.height;  in scroll_cursor_bot()
1988 	    curwin->w_topfill = loff.fill;  in scroll_cursor_bot()
2029     if (!hasFolding(curwin->w_cursor.lnum, &loff.lnum, &boff.lnum))  in scroll_cursor_bot()
2032 	loff.lnum = cln;  in scroll_cursor_bot()
2036     loff.fill = 0;  in scroll_cursor_bot()
2042     while (loff.lnum > 1)  in scroll_cursor_bot()
2049 		&& loff.lnum <= curwin->w_botline  in scroll_cursor_bot()
2051 		&& (loff.lnum < curwin->w_botline  in scroll_cursor_bot()
2052 		    || loff.fill >= fill_below_window)  in scroll_cursor_bot()
2058 	topline_back(&loff);  in scroll_cursor_bot()
2059 	if (loff.height == MAXCOL)  in scroll_cursor_bot()
2062 	    used += loff.height;  in scroll_cursor_bot()
2065 	if (loff.lnum >= curwin->w_botline  in scroll_cursor_bot()
2067 		&& (loff.lnum > curwin->w_botline  in scroll_cursor_bot()
2068 		    || loff.fill <= fill_below_window)  in scroll_cursor_bot()
2073 	    scrolled += loff.height;  in scroll_cursor_bot()
2074 	    if (loff.lnum == curwin->w_botline  in scroll_cursor_bot()
2076 			    && loff.fill == 0  in scroll_cursor_bot()
2174     lineoff_T	loff;  in scroll_cursor_halfway()  local
2184     loff.lnum = boff.lnum = curwin->w_cursor.lnum;  in scroll_cursor_halfway()
2186     (void)hasFolding(loff.lnum, &loff.lnum, &boff.lnum);  in scroll_cursor_halfway()
2189     used = plines_nofill(loff.lnum);  in scroll_cursor_halfway()
2190     loff.fill = 0;  in scroll_cursor_halfway()
2193     used = plines(loff.lnum);  in scroll_cursor_halfway()
2195     topline = loff.lnum;  in scroll_cursor_halfway()
2218 	    topline_back(&loff);  in scroll_cursor_halfway()
2219 	    if (loff.height == MAXCOL)  in scroll_cursor_halfway()
2222 		used += loff.height;  in scroll_cursor_halfway()
2225 	    above += loff.height;  in scroll_cursor_halfway()
2226 	    topline = loff.lnum;  in scroll_cursor_halfway()
2228 	    topfill = loff.fill;  in scroll_cursor_halfway()
2380     lineoff_T	loff;  in onepage()  local
2415 	loff.fill = 0;  in onepage()
2443 		loff.lnum = curwin->w_botline;  in onepage()
2445 		loff.fill = diff_check_fill(curwin, loff.lnum)  in onepage()
2448 		get_scroll_overlap(&loff, -1);  in onepage()
2449 		curwin->w_topline = loff.lnum;  in onepage()
2451 		curwin->w_topfill = loff.fill;  in onepage()
2487 	    loff.lnum = curwin->w_topline - 1;  in onepage()
2489 	    loff.fill = diff_check_fill(curwin, loff.lnum + 1)  in onepage()
2492 	    get_scroll_overlap(&loff, 1);  in onepage()
2494 	    if (loff.lnum >= curbuf->b_ml.ml_line_count)  in onepage()
2496 		loff.lnum = curbuf->b_ml.ml_line_count;  in onepage()
2498 		loff.fill = 0;  in onepage()
2502 		botline_topline(&loff);  in onepage()
2505 	    curwin->w_cursor.lnum = loff.lnum;  in onepage()
2510 	    while (n <= curwin->w_height && loff.lnum >= 1)  in onepage()
2512 		topline_back(&loff);  in onepage()
2513 		if (loff.height == MAXCOL)  in onepage()
2516 		    n += loff.height;  in onepage()
2518 	    if (loff.lnum < 1)			// at begin of file  in onepage()
2530 		topline_botline(&loff);  in onepage()
2532 		botline_forw(&loff);  in onepage()
2533 		botline_forw(&loff);  in onepage()
2535 		botline_topline(&loff);  in onepage()
2539 		(void)hasFolding(loff.lnum, &loff.lnum, NULL);  in onepage()
2544 		if (loff.lnum >= curwin->w_topline  in onepage()
2546 			&& (loff.lnum > curwin->w_topline  in onepage()
2547 			    || loff.fill >= curwin->w_topfill)  in onepage()
2554 		    loff.fill = curwin->w_topfill;  in onepage()
2558 		    if (curwin->w_topfill == loff.fill)  in onepage()
2573 		    curwin->w_topline = loff.lnum;  in onepage()
2575 		    curwin->w_topfill = loff.fill;  in onepage()