Code review comment for lp:~mir-team/mir/cursor-spike-phase-1-resubmit

+1 for RAOF's thoughts at 22:49-22:51 and for Daniel's points.
As for the cursor always being on top of everything, it seems a bit more flexible not to bake that into mir and have that be a decision of the shell stuff. (I could see someone wanting a cursor to go under a pop-up notification maybe)