patch 9.1.0380: Calculating line height for unnecessary amount of lines

Problem:  Calculating line height for unnecessary amount of lines with
          half-page scrolling (zhscn, after 9.1.0280)
Solution: Replace "limit_winheight" argument with higher resolution
          "max" argument to which to limit the calculated line height
          in plines_m_win() to (Luuk van Baal)

fixes: #14650
closes: #14652

Signed-off-by: Luuk van Baal <luukvbaal@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/drawscreen.c b/src/drawscreen.c
index f8818ff..9096c28 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -1781,7 +1781,7 @@
 	    if (j < wp->w_height - 2)		// not too far off
 	    {
 		i = plines_m_win(wp, wp->w_topline, wp->w_lines[0].wl_lnum - 1,
-									 TRUE);
+								wp->w_height);
 #ifdef FEAT_DIFF
 		// insert extra lines for previously invisible filler lines
 		if (wp->w_lines[0].wl_lnum != wp->w_topline)