postMessage - targetOrigin does not contains port number

[ctomczyk]

Current behavior

When the skins are upgraded then the communication to the parent node using postMessage is blocked when the user is on the URL that has specified port. Example: example.com:81.

I see in console:

Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('​http://localhost') does not match the recipient window's origin ('​http://localhost:81').

Expected behavior

File wp-admin\includes\class-wp-upgrader-skins.php line 168 contains:

window.parent.postMessage( JSON.stringify( { action: "decrementUpdateCount", upgradeType: "' . $type . '" } ), window.location.protocol + "//" + window.location.hostname );

The targetOrigin for the postMessage should also contains port number. E.g. window.location.hostname + window.location.port

[ctomczyk]

The message in console