Port the OpenPGP applet to GTK+ 3
_Originally created by @intrigeri on [#7711 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/7711)_ The code currently lives at <https://git-tails.immerda.ch/nodens/openpgp-applet/>. Work should be done in the master branch first. Updating the upstream metadata (dependencies in `META.yml` and/or `Makefile.PL`, etc.) would be appreciated. Testing on current Debian stable *and* unstable is important. Feature Branch: nodens:feature/7711-Gtk3 ### Related issues - **Blocks** tails/tails#8310 - **Blocks** tails/tails#5967 - [x] **Blocked by** tails/tails#10190 - **Blocks** tails/tails#11899
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