The `select_non_existing` lua script selects existing images

When Darktable's library contains images with cyrillic characters in the file path, the select_non_existing lua script selects those images in the library even though they exist on disk and display correctly in Darktable. It is a very similar to my earlier purge_nonexistent_images.bat issue.
It seems like the problem appears only on Windows, because when I tested on MacOS it worked fine.

Here's what gets selected after I click the "select non existing" button:

The expected selection would be:

Commencez par localiser le script Lua select_non_existing et examinez comment il vérifie les chemins de fichiers sous Windows. Reproduisez le problème avec des images existantes dont les chemins contiennent des caractères cyrilliques, puis vérifiez que seules les images manquantes sont sélectionnées. Comparez le comportement avec macOS si disponible.