Indicate file format link set by filter

[crstauf]

If the filter qm/output/file_link_format has a callback, disable the editor selection, and inform user.

[johnbillion]

Good idea thanks. If you can refresh this branch to include the Nova support I'll merge it in 👍

[crstauf]

@johnbillion Conflicts resolved.

[johnbillion]

Thanks. Not sure why the PHP tests are failing again, I think I need to pin PHPStan.