We would like to reduce the number of net-libs/webkit-gtk slots.
Please check if it is possible to migrate from net-libs/webkit-gtk:4 to net-libs/webkit-gtk:4.1.
This should be possible (with minor build-system patching, see https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=ea0bb7cd3b47dd02d964a5c27c010eeaea8cc8b1 for example) if net-libs/libsoup:2.4 is not pulled in by the package or any of its dependencies.
Looks like this package depends on libsoup:2.4 :(
There's an upstream issue requesting it be ported to :3.0 here: https://gitlab.gnome.org/GNOME/gthumb/-/issues/244