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/proto/misc1.pro b/src/proto/misc1.pro
index e76bf75..d64f961 100644
--- a/src/proto/misc1.pro
+++ b/src/proto/misc1.pro
@@ -7,7 +7,7 @@
 int plines_win_nofill(win_T *wp, linenr_T lnum, int limit_winheight);
 int plines_win_nofold(win_T *wp, linenr_T lnum);
 int plines_win_col(win_T *wp, linenr_T lnum, long column);
-int plines_m_win(win_T *wp, linenr_T first, linenr_T last, int limit_winheight);
+int plines_m_win(win_T *wp, linenr_T first, linenr_T last, int max);
 int gchar_pos(pos_T *pos);
 int gchar_cursor(void);
 void pchar_cursor(int c);