My company does a lot of cleanroom design where spaces are assigned Cleanliness classifications. For instance B is cleaner than C and C is cleaner than D etc. However we have some spaces that are B/C which will be an air lock separating B and C. It would be great if we could have a space colour which is half and half in the diagonal (Left is B colour and right is C colour for example).
See Capture1 which is the original
Capture2 which is what I would like (Done using filled region with the black being same green as on the left hand side)