joomla/joomla-cms — pull request #3108 by s2software (2014-02-14 10:23:36+00:00)
Title: Let users define TinyMCE valid elements

(insted of extended valid elements that has no effect)
For exemple, if I need to prevent empty tag strip, have to define "[]" in TinyMCE valid_elements option. If I define "[]" in extended_valid_elements (like Joomla current code), it doesn't work.