Do not run menu action if the menuitem is disabled

The click event can still be triggered by the shortcut or event by clicking on
the disabled menuitem. So the callback must not run the action if the menuitem
is disabled.

Closes #13326

sao/src/tab.js

@@ -158,7 +158,9 @@
                     this.menu_buttons[item.id] = menuitem;
                     link.click(evt => {
                         evt.preventDefault();
-                        this[item.id]();
+                        if (!menuitem.hasClass('disabled')) {
+                            this[item.id]();
+                        }
                     });
                 } else if (!item && previous) {
                     menuitem = jQuery('<li/>', {