vim-patch:9.0.0114: the command line takes up space even when not used

Problem:    The command line takes up space even when not used.
Solution:   Allow for 'cmdheight' to be set to zero. (Shougo Matsushita,
            closes vim/vim#10675, closes vim/vim#940)
f39cfb7262

Omit win_redr_ruler() change: winbar may still need redraw.
Omit win_update() changes: Nvim doesn't use `Rows` there.
Omit redraw_asap(): removed.

src/nvim/screen.c

@@ -6501,7 +6501,7 @@ static void win_redr_ruler(win_T *wp, bool always)
   bool is_stl_global = global_stl_height() > 0;
   static bool did_show_ext_ruler = false;
 
-  // If 'ruler' off or redrawing disabled, don't do anything
+  // If 'ruler' off, don't do anything
   if (!p_ru) {
     return;
   }