well... I didn't know that attachments didnt work here in this list... sorry!
The patch is here: http://aluno.no-ip.info/juca/mw-AjaxMathPreview-idea.diff
It uses the texvc backend to generate the images, so I imagine that it is a 100% accurate preview. I intend to improve its usability, of couse. This version it too limited in usability and features:
*direct input to the inputbox is not implemented yet. *the functions menu is messy and non-user friendly (at least for LaTeX newbies) **I intend to make categories in the functions menu *I thought about mapping mouse events on the preview image so that the user can select the place in the formula where the next chosen math elements will be inserted. But I have no idea about how to generate these positions cordinates in the server. Maybe the backend must be modified to provide these cordinates. If that is not possible (or not practical) then we must find another solution for this issue. *I thought also about embedding the mathpreview image inside the edit box (just like gmail does with tables in "Rich formatting" mode) but I also have no idea about how to manipulate the editbox widget to achieve this effect.
Felipe "Juca" Sanches