Resize loop

Hi,

Configuration:

* Moodle 3.7

* Browser: Firefox 85.0.2

Firefox enters a resizing loop which exhausts CPU ressources. As a consequence the browser becomes irresponsive or javascript functions appears to not fire up

I modified the code of embed.js like so to get around this issue

resizeDelay = undefined;

H5P.on(instance, 'resize', function() {
        if (H5P.isFullscreen) {
            return; // Skip iframe resize.
        }

        // Use a delay to make sure iframe is resized to the correct size.
        if (resizeDelay===undefined) {
        resizeDelay = setTimeout(function() {
            // Only resize if the iframe can be resized.
            if (parentIsFriendly) {
                H5PEmbedCommunicator.send('prepareResize',
                    {
                        scrollHeight: iFrame.contentDocument.body.scrollHeight,
                        clientHeight: iFrame.contentDocument.body.clientHeight
                    }
                );
            } else {
                H5PEmbedCommunicator.send('hello');
            }
            resizeDelay=undefined;
        }, 1000);
        }
    });

Sincere regards,

Bruno