Hello,
For information, the Cast3M software is available for free with the "Education-Research" license (http://www-cast3m.cea.fr/index.php?page=dlcastem) and it is widely used by universities, students and companies all around the world. Note that it is not a "freenium" software. The paid version does not have more features, on the contrary, the user is more restricted but have guarantees...
If I make a pull request to scintilla and they accept, you think that you could integrate it on the Geany ?
In any case, I would like to thank all Geany development team for this very useful software.
Sincerely,
Thibault LINDECKER