Embed blog comments: offsetHeight of document.body when both html and body selectors defined with a 100% height returns 0 every time, so blog comments will never appear. JavaScript's scrollHeight method is not affected by CSS height rules as it evaluates the scroll height of a document based on its content and padding, NOT the CSS height and other overrideable styles.
Embed blog comments: incremented core version to break cache.
Embed blog comments: testing concluded that it's just easier to override the body's height attribute for the content within an iframe before calculating it. Setting the body height to auto will allow offsetHeight to retrieve its height, while a body height of 100% inside an iframe of height 0 returns a body height of 0.
Merge branch 'stage' of github.com:vanilla/vanilla into feature/embedblogcomments-fix

Conflicts:
	index.php
Fix version progression in hotfix
Merge pull request #2002 from vanilla/feature/embedblogcomments-fix

Embedded blog comments loading with a height of 0.