Merge pull request #24476 from neovim/backport-24425-to-release-0.9

[Backport release-0.9] fix(terminal): call validate_cursor to update the viewport

src/nvim/terminal.c

@@ -531,6 +531,7 @@ static int terminal_check(VimState *state)
   }
 
   terminal_check_cursor();
+  validate_cursor();
 
   if (must_redraw) {
     update_screen();