patch 8.2.2581: Vim9: sourcing Vim9 script triggers a redraw

Problem:    Vim9: sourcing Vim9 script triggers a redraw.
Solution:   Do not let setting/restoring 'cpoptions' cause a redraw.
            (closes #7920)
diff --git a/src/optionstr.c b/src/optionstr.c
index a1cbe26..521242d 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -2461,11 +2461,14 @@
 		   && (get_option_flags(opt_idx) & (P_CURSWANT | P_RALL)) != 0)
 	curwin->w_set_curswant = TRUE;
 
+    if ((opt_flags & OPT_NO_REDRAW) == 0)
+    {
 #ifdef FEAT_GUI
-    // check redraw when it's not a GUI option or the GUI is active.
-    if (!redraw_gui_only || gui.in_use)
+	// check redraw when it's not a GUI option or the GUI is active.
+	if (!redraw_gui_only || gui.in_use)
 #endif
-	check_redraw(get_option_flags(opt_idx));
+	    check_redraw(get_option_flags(opt_idx));
+    }
 
 #if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
     if (did_swaptcap)