I didn’t do it in GTK+, because getting per-cell tooltips into GTK+ requires “doing it right,” which pretty much means a compete overhaul of the tooltip system. That’s a huge amount of work — certainly a lot more than I have time for right now.

I don’t feel bad about putting dirty hacks like this into libsexy, because that’s what libsexy is made for. When GTK+ has it, I’ll deprecate this (and eventually remove it) to get people to move away from it. Until then, this will let people do what they need to do, even if it’s not the most efficient or correct way.