[g2.2pre-834] Sector_Set3dFloor FF_FADEWALLS flag is broken

[MaxED]

In zdoom-2.9pre-437, floor, ceiling and walls below the extrafloor with the FF_FADEWALLS flag are fogged (can we has this behaviour everywhere, regardless of which implementation was the first/more important/whatever?..).
In gzdoom-g2.2pre-834 only floor and walls are fogged.
In gzdoom-g1.10pre only walls are fogged.

[Graf Zahl]

Surely it should work like that - but making it work consistently will necessitate some refactoring of the internal colormap structure - which at the moment makes its 'fade' entry double as both blend and fog value - and this is creating problems now.