Exec key from desktop files gets trimmed when installed by snapd

[Olivier Tilloy]

Since snapcraft 2.25 (and the fix for bug #1588359), desktop files get invalid Exec keys for some snaps, and it appears that consequently snapd removes the key altogether when installing the snap.

$ grep Exec /snap/tus/current/meta/gui/tus.desktop
Exec=tus.tus %U

(note how `tus.tus` is not a valid alias, it won’t launch if executed in a terminal, the valid command is `tus`)

$ grep Exec /var/lib/snapd/desktop/applications/tus_tus.desktop || echo "no Exec line"
no Exec line

[Olivier Tilloy (osomon)]

Fix at https://github.com/snapcore/snapcraft/pull/1061.