People were experiencing some issues when running GTK 4.16 apps
under kwin, which now enables the experimental Wayland protocol
by default. While the testing is valuable, we don't want to
make users of the stable GTK guinea pigs, so switch color
management from opt-out to opt-in. Use
GDK_DEBUG=color-mgmt
to enable use of the xx-color-manager-v4 protocol.
ead04fe615
