misc: prevent double click in display_message_and_continue.html (#60815)

src/authentic2/templates/authentic2/display_message_and_continue.html

@@ -7,9 +7,21 @@
   </div>
   {% if only_info %}
     <script>
-    window.setTimeout(function () {
-      document.getElementById('a2-continue').click();
-    }, 3000);
+    $(function () {
+      var $a2_continue = $('#a2-continue');
+      var clicked = false;
+      $a2_continue.on('click', function (event) {
+        if (! clicked) {
+          # prevent double click for 3 seconds
+          clicked = true;
+          window.setTimeout(function () { clicked = false; }, 3000);
+        } else {
+          event.preventDefault();
+        }
+      });
+      # automatic click after 3 seconds
+      window.setTimeout(function () { if (!clicked) { $a2_continue.click(); } }, 3000);
+    });
     </script>
   {% endif %}
 {% endblock %}