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It was never meant to be used for anything other than testing and setting it globally can cause weird loops in GTK-based portals, where the portal will end up waiting for itself until it times out. https://github.com/NixOS/nixpkgs/issues/135898 Or it can mess up fonts: https://github.com/NixOS/nixpkgs/issues/155291#issuecomment-1166199585 Having the option in NixOS makes it look like it is okay or even desirable to enable, when in fact it is a hack that can subtly break apps. Some apps allow opting into using portal-based APIs, e.g. for Firefox, you can set `widget.use-xdg-desktop-portal.file-picker` to `1` in about:config. Otherwise, you can set the `GTK_USE_PORTAL` environment variable to 1 for individual apps. People who really want it and aware of the downsides can just set `environment.sessionVariables.GTK_USE_PORTAL = "1";` NixOS option directly to set the environment variable globally. |
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