Don't close the edit panel if the user write and select a Latex formula,
a link or a special character

- Select resources from edu-sharing
- Use edu-sharing rendering service to display the resources
- Synchronize usage between OpenOLAT and edu-sharing
- Exchange configuration (metadata) between OpenOLAt and edu-sharing

If the informations (size of file, max size allowed) is available,
validate first the size client side before making a validation on the
server.

Use the same protection in D&D match interaction against pushing twice
the same source element in the same target