patch 9.0.0469: cursor moves if cmdwin is closed when 'splitscroll' is off

Problem:    Cursor moves if cmdwin is closed when 'splitscroll' is off.
Solution:   Skip win_fix_cursor if called when cmdwin is open or closing.
            (Luuk van Baal, closes #11134)
diff --git a/src/globals.h b/src/globals.h
index 5218324..568d3b3 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1737,3 +1737,8 @@
 // While executing a regexp and set to OPTION_MAGIC_ON or OPTION_MAGIC_OFF this
 // overrules p_magic.  Otherwise set to OPTION_MAGIC_NOT_SET.
 EXTERN optmagic_T magic_overruled INIT(= OPTION_MAGIC_NOT_SET);
+
+#ifdef FEAT_CMDWIN
+// Skip win_fix_cursor() call for 'nosplitscroll' when cmdwin is closed.
+EXTERN int skip_win_fix_cursor INIT(= FALSE);
+#endif