We often opt to add multiple blocks of text in articles through a plugin when developing custom websites (altering the forms based on the article's chosen layout).
Sometimes adding them in their own tab is not the preferable option - sometimes the UX is better when the content is right on the main content tab.
In such cases, we use the 'extra-content' fieldset and this modification adds to the UI in the backend.
I have tested this item successfully on d67daf0
It works great!
This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/7847.