Flatpak sandboxing breaks two things in VSCodium/VSCode on a Fedora Kinoite-based distro (at least in my case): trashbin doesn’t work, and it won’t talk to KWallet to store github credentials, so it either nags for passwords or stores tokens in plain text.

How to do it?

Fix trash

Electron tries to delete files directly instead of going through the portal. Force it to use gvfs:

flatpak override --user --filesystem=xdg-data/Trash com.vscodium.codium
flatpak override --user --env=ELECTRON_TRASH=gvfs-trash com.vscodium.codium

(Or same thing via Flatseal: Filesystem > Other files > xdg-data/Trash, then Environment > ELECTRON_TRASH=gvfs-trash.)

Fix KWallet integration

In Flatseal, VSCodium > Session Bus > Talks, add:

• org.kde.kwalletd5
• org.kde.KWallet
• org.kde.kwalletd6 (Plasma 6+)

Close and reopen VSCodium!

Verify

flatpak override --user --show com.vscodium.codium

• Trash: delete a file in VSCodium, should just work, no permanent-delete prompt.
• KWallet: sign into GitHub, KWallet should intercept. If it keeps asking for a password, check pam_kwallet is installed and your KWallet password matches your login password.