How to Make the Multisite My Sites List Scroll

If you look at the number of pre-built model websites I offer, you can see why I started looking for “How to Make the Multisite My Sites List Scroll”! I find it a strange thing that the issue of the “My Sites” menu in a multisite WordPress implementation hasn’t been addressed in the WordPress core. I would have thought that this would be a problem for a lot of people who offer WordPress hosting through multisite. But it looks like I’m wrong. I have only found one place where it is seriously addressed by the core developers:

My Sites limited to 23 sites on Admin Bar

Here’s the code they suggest as a patch to fix the problem:

[php]
/**
* Make the My Sites list scroll if too many blogs
*/
function custom_my_sites() {
$user_id = get_current_user_id();
$user_blogs = get_blogs_of_user( $user_id );
if (count($user_blogs) > 12) {
echo ‘<style type="text/css">
#wp-admin-bar-my-sites-list {
max-height: 90vh;
overflow-y: auto;
overflow-x: visible;
}
#wpadminbar .menupop li.hover {
position: relative;
}
#wpadminbar .menupop li.hover > .ab-sub-wrapper {
margin-left: 337px;
margin-top: -32px;
position: fixed;
}
</style>’;
}
}
add_action(‘admin_head’, ‘custom_my_sites’);
[/php]

I implemented the code and it works although not “elegantly”. The center scroll tends to simultaneously make the background window scroll at the same time.