Just to be clear, because it's non-obvious, Arch Linux has a single patch (not stored in .patch file however), but all things considered it's very simple.

    sed -i '/dbus_conf_dir/s/sysconfdir/datadir/g' meson.build

This likely is needed for the package to build to begin with.

I'm not sure what this supposed to demonstrate. I literally said that Arch Linux probably applies downstream patches to a lesser degree than Ubuntu. My point was that the person I responded to made it sound as if Arch Linux doesn't do any patching, which is obviously false since they have dozens if not hundreds of packages with downstream patches.