There is no need to block xdg-desktop-portal-gnome via unsupported USE flag since xdg-desktop-portal is controlled by XDG_CURRENT_DESKTOP environmental variable and /usr/share/xdg-desktop-portal/kde-portals.conf !unsupported? ( !gui-apps/qt6ct !sys-apps/xdg-desktop-portal-gnome ) Plasma 5 does not have this requirement. Reproducible: Always Steps to Reproduce: 1. Have gnome-shell installed 2. Intall (or upgrade) Plasma 6 with USE="-unsupported" Actual Results: sys-apps/xdg-desktop-portal-gnome blocks kde-plasma/plasma-meta-6
See https://github.com/gentoo/kde/pull/996. It's still unclear why it got added to the upstream recommendations, but I agree with your reasoning.
commit 1c83a085d4c37c247d844dfc0b0f9a76e642763b (HEAD -> master, origin/master, origin/HEAD) Author: Sam James <sam@gentoo.org> Date: Sun Jun 23 18:49:28 2024 +0100 kde-plasma/plasma-meta: fix libc++ workaround advice Rin Cat points out on the bug that it should be =2, not =1. Also, clarify the need to rebuild packages afterwards. Bug: https://bugs.gentoo.org/923292 Signed-off-by: Sam James <sam@gentoo.org> commit 4bb15ec8903655113926f08c2819e4783cfd95b2 Author: Sam James <sam@gentoo.org> Date: Sun Jun 23 18:44:25 2024 +0100 kde-plasma/plasma-meta: allow xdg-desktop-portal-gnome with USE=-unsupported USE=-unsupported (the default) banning coinstalls with sys-apps/xdg-desktop-portal-gnome caused issues with users either migrating between KDE Plasma and GNOME or wanting to have both installed, so it prompted me to look into it again. xdg-desktop-portal-kde installs kde-portals.conf which is used and preferred within the Plasma desktop, so we have no issue here. (Done in upstream commit ae9b326e55ca4a25a762cf0bfe96f5e947765833). The recommendation to not coinstall them was added upstream in April 2023 at https://community.kde.org/index.php?title=Distributions/Packaging_Recommendations&diff=prev&oldid=96239, while the aforementioned upstream commit is from May 2023. Cloess: https://bugs.gentoo.org/934823 Signed-off-by: Sam James <sam@gentoo.org>