The initial focused element should be the first operator button.
This commit also fixes the accessibility issues that previously were
wrongly fixed by a redundant click on the first tab using javascript.
* Remove all traces of mathjax from the atto equation editor - it is filter agnostic
* Add a M.core.event module for core events that can be published/subscribed to by plugins (loose coupling)
* Add a FILTER_CONTENT_UPDATED event so plugins can tell the filter system when nodes are added to the page
* Implement a listener for this event in the MathJax filter
* Fire this event from the equation editor and from the glossary filter
* Add a nolink tag to the mathjax filter, so equations will not be processed by the other filters
* Add a smarter throttle function to the equation editor preview updates (Y.throttle is dumb)
This equation editor relies on whatever the currently configured filter is to do the rendering.
If there is no filter that handles latex ($$ blah $$) - this plugin will not show up.
This will not work with the solutions on the forums of adding MathJax in the header of the page,
but it will work with a real mathjax filter written for Moodle (work in progress). It works with
the existing tex filter.
Shamim Rezaie