Comment 12 for bug 657266

Sorry to ask dumb questions , Peter.
But I most likely cannot expect someone else to do so :)
Did I understand correct that the "unoccupied state" needs a code modification for each bulding separetely?
What I'd like to know, is whether now all building can discern "idle" from unoccupied, or only those that you fixed?
Can we put in some building_u_??.png and all houses will know when to use it?