As I said in the PR notes, I don't know why the indentation has gone wonky here - it's fine in my local copy.

All I've done in this file is move the <a> tag so it only wraps the image and title, and replace it with a <blockquote> tag - It works without <blockquote>, but I thought it would be more robust with something wrapping other than <div> wrapping all the elements, and blockquote seemed the best option. If there's no need for anything other than <div>, I'll happily remove it.

I'm not even sure what this file does. It is more or less a duplicate of ````opengraph_tpl.jst.hbs```` with a <section class="photoviewer"> at the start and an extra ````if```` routine.  I asked netom on the other thread about this file and if it is still required - am waiting to hear from him. Amending it doesn't seem to have any effect on OG preview behaviour.