playpen/assets/icons/README.md

Bundled icons

Symbolic icons copied from adwaita-icon-theme 50.0 (the version pinned by flake.nix), licensed under CC BY-SA 3.0 or LGPL v3, at the theme's option.

They are compiled into the binary (see icons.gresource.xml, build.zig, and src/icons.zig) because the app refers to them by freedesktop name, and recent icon-theme releases dropped many of these legacy names — whether a host machine still resolves them is luck. GNOME's own guidance is that apps ship the icons they use.

Everything lives under scalable/actions/ regardless of the icon's original category: GTK's resource lookup goes by name, not category, and one flat directory keeps the manifest honest.