The code is pretty ugly, though it works. I think some refactoring will
be required sooner or later

Edition is possible, but has absolutely no effect.

Developers: you can use the 'Escape' key to bypass it :)

Comes with keyboard shortcut :D

You're asked if you want to save your change, discard, or cancel.

There may be remaining references in commented code.

Everything is now handled in frames, and not in "vlc positions"

This avoid deadlocks introduced in previous commit, and clarify the code.

Selection media cell in Library