Hi Nicolas, If you wish GParted to run under Wayland, then it needs to be built with the --enable-xhost-root configure option. Notice that this is the way Fedora configures their RPM packages [1].
[1] https://koji.fedoraproject.org/koji/packageinfo?packageID=1950 If you click on "gparted-1.0.0-3.fc31" then under "Logs" for "x86_64" and click on "build.log" [2] you can search and find "--enable-xhost-root". [2] https://kojipkgs.fedoraproject.org//packages/gparted/1.0.0/3.fc31/data/logs/x86_64/build.log 'Hope that helps. Regards, Curtis