vim-patch:9.0.0643: smoothscroll test fails

Problem:    Smoothscroll test fails.
Solution:   Check if skipcol changed.

https://github.com/vim/vim/commit/b34c4b7863af8718ad726173585dd38a7c292f0f

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/normal.c

@@ -2633,6 +2633,7 @@ static void nv_scroll_line(cmdarg_T *cap)
 void scroll_redraw(int up, long count)
 {
   linenr_T prev_topline = curwin->w_topline;
+  int prev_skipcol = curwin->w_skipcol;
   int prev_topfill = curwin->w_topfill;
   linenr_T prev_lnum = curwin->w_cursor.lnum;
 
@@ -2651,6 +2652,7 @@ void scroll_redraw(int up, long count)
     // we get stuck at one position.  Don't move the cursor up if the
     // first line of the buffer is already on the screen
     while (curwin->w_topline == prev_topline
+           && curwin->w_skipcol == prev_skipcol
            && curwin->w_topfill == prev_topfill) {
       if (up) {
         if (curwin->w_cursor.lnum > prev_lnum