Urs Hunkler

Thank you very much for your answers Tim and Darko.

I try to find a way to define collapsed columns while setting up a flexible_table. 

What I see is that users can collapse columns and the collapsed column state is saved in the $SESSION.

How can I define columns as collapsed when the flexible_table is set up?

I worked with the command line and moosh to clear the cache and just noticed that I ran moosh in another Moodle directory. So the reason why the classes did not register seam to be me working in the wrong directory - ouch.

I forgot to mention that I did increase the number in version.php with each change. The higher number and the connected plugin update seamed not to register the classes.

Tim, your proposal is awesome! I was "brave enough to try this" - and it works

Kudos to your knowledge - there is only one small change necessary in your code examples:

"class name local_sharedrenderers_core_media_renderer" needs to be "class local_sharedrenderers_core_media_renderer"

And the only thing needed is telling the renderer system to also look for renderer classes at "local/sharedrenderers" in the line:

$this->prefixes[] = 'local_sharedrenderers';

Thanks a lot.