Alt-R transforms should respect starting position from blueprint

[hovissimo]

Let's say I have a simple room from a hallway:

#dig start(1; 2; doorway from hall) a weird room
##ddd#
dddd##
##ddd#
######

And assuming I have a vertical hallway somewhere and I want to macro in this trivial room, I can just out my cursor where I want the doorway to be and let 'er rip.

Now, if I want to use the same blueprint for a room that goes west, I can use Alt-R and 'fliph', but now if I try this again with the cursor where I want the new doorway, the room is designed over my hallway (to the east, even though the designated room is flipped).

My expectation was that when I use fliph, my starting position would also be 'flipped'.