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Move Thunderbird from native pacman to org.mozilla.Thunderbird flatpak,
mirroring the LibreWolf migration. Bubblewrap isolates the mail client from
the rest of $HOME (ssh keys, password store, gpg sockets); intra-process
isolation regression is real but minor (same tradeoff as the browser).
Three cross-sandbox glue points handled in repo:
- run_onchange_after_deploy-thunderbird.sh.tmpl: profile path moves from
~/.thunderbird to ~/.var/app/org.mozilla.Thunderbird/.thunderbird
- run_onchange_after_deploy-pteid-pkcs11.sh.tmpl: refactored to iterate
over (LibreWolf, Thunderbird) instead of hard-coding LibreWolf, so
cartão de cidadão signing/encryption works for S/MIME in TB
- run_onchange_after_deploy-tb-eer.sh.tmpl (new): bridges
external-editor-revived's native messaging host into the sandbox via
a flatpak-spawn --host wrapper + relocated manifest
Other surfaces (Bridge, Radicale, libsecret, mako, OpenPGP) are covered
by Flathub default permissions.
Manual one-shot migration on host (after pulling + just sync): close TB,
copy ~/.thunderbird/. into ~/.var/app/org.mozilla.Thunderbird/.thunderbird/,
chezmoi apply -v, then xdg-mime default org.mozilla.Thunderbird.desktop
x-scheme-handler/mailto. Once verified working, archive the old profile
via mv ~/.thunderbird ~/.thunderbird.pre-flatpak.bak.
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sommerfeld