dev-dotnet/gnome-desktop-sharp is locked on the corresponding gnome-base/gnome-desktop despite it is not required (at least build successfully with newer version). Reproducible: Always
That restriction is not there for build-time purposes, it's for runtime purposes. gnomedesktop-sharp.dll.config hardcodes a specific .so.n version with which it will work. Verified with gnome-desktop git that .so number will not be bumped in current release cycle unless drastic last-minute changes are introduced. Changed gtk-sharp-module eclass accordingly.