patch 9.1.0708: Recursive window update does not account for reset skipcol

Problem:  Window is updated with potentially invalid skipcol in recursive
          window update path. I.e. cursor outside of visible range in
          large line that does not fit.
Solution: Make sure it is valid (Luuk van Baal).

closes: #15605

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 9096c28..1802ade 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -2774,7 +2774,7 @@
 		    redrawWinline(wp, wp->w_cursor.lnum);
 	    }
 #endif
-	    // New redraw either due to updated topline or due to wcol fix.
+	    // New redraw either due to updated topline, wcol fix or reset skipcol.
 	    if (wp->w_redr_type != 0)
 	    {
 		// Don't update for changes in buffer again.
@@ -2782,6 +2782,7 @@
 		curbuf->b_mod_set = FALSE;
 		j = curbuf->b_mod_xlines;
 		curbuf->b_mod_xlines = 0;
+		curs_columns(TRUE);
 		win_update(curwin);
 		curbuf->b_mod_set = i;
 		curbuf->b_mod_xlines = j;