[Building Sakai] Equation images removed from answers in Samigo

[Daniel Merino]

Hi everybody.

After going to 2.9.2, we are currently receiving quite complaints of 
teachers who have lost answers in Samigo questions after editing them.

These answers are embedded images with equations. I have tested that is 
happening in our 2.9.2 server and that in a trunk qa server 
(http://sakai-trunk.atica.um.es/portal/) I can also replicate the issue.

For example, when creating or editing a multiple choice question in a 
pool, if user adds as answer the next HTML code:

<img 
src="http://latex.codecogs.com/gif.latex?\frac{\mathrm{d}&space;35x}{\mathrm{d}&space;x*2}" 
title="\frac{\mathrm{d} 35x}{\mathrm{d} x*2}" />

and then saves the question, answer is deleted and no error is thrown in 
screen neither in Sakai's log.

Other images are saved correctly, so I think this is some issue with 
Latex code in img tag. AFAIK this didn't happen in Sakai 2.7.

I have tried to track the issue, but I haven't found nothing. Please, 
could somebody tell me where answers texts are validated in Samigo?

Thanks in advance.
Best regards.
-- 
Daniel Merino Echeverría
daniel.merino at unavarra.es
Gestor de teleformación - Centro Superior de Innovación Educativa.
Tfno: 948-168489 - Universidad Pública de Navarra.