The package should have 'kde-frameworks/extra-cmake-modules' in build dependencies because it is required to build and fails otherwise.
Steps to Reproduce:
1. Get a system where 'kde-frameworks/extra-cmake-modules' is not installed.
2. Try to emerge 'kde-misc/bismuth'.
The package should pull 'kde-frameworks/extra-cmake-modules' as a build dependency.
This should have been using ecm.eclass (replacing cmake, xdg) from the beginning, if it uses ECM.
Upstream also claims this is broken with Plasma-5.27, which comes with its own Tiling integration:
Does it make any sense to keep it in ::gentoo then?
A patch from pull/490 fixes the issue with Wayland. Btw it will be good to see it here.
Plasma 5.27 native tiling is super basic and not nearly as usable.