vim-patch:8.2.4739: accessing freed memory after WinScrolled autocmd event (#18090)

Problem:    Accessing freed memory after WinScrolled autocmd event.
Solution:   Check the window pointer is still valid. (closes vim/vim#10156)
            Remove the argument from may_trigger_winscrolled().
d58862d18f

src/nvim/edit.c

@@ -1545,7 +1545,7 @@ static void ins_redraw(bool ready)
 
   if (ready) {
     // Trigger Scroll if viewport changed.
-    may_trigger_winscrolled(curwin);
+    may_trigger_winscrolled();
   }
 
   // Trigger BufModified if b_changed_invalid is set.