Gravatar Module HTTPS-unfriendly

I don't know if this would be better categorized as a feature request or a bug report... for ME it's a bug, because it's keeping me from using the module until it's fixed (warnings like this are a no-no on a site that's going to be doing eCommerce activity)....

When using the SecurePages module to serve user profile pages via HTTPS, web browsers display "unsecure content" warnings. If I could track down where the URL is being served from, I'd attempt a fix myself... I'm thinking something like this...

Without having delved into the code yet, perhaps something similar too..

if (!empty($_SERVER['HTTPS'])) {
    $gravatar_base_url = 'https://secure.gravatar.com';
} else {
    $gravatar_base_url = 'http://www.gravatar.com';
}