Once it's done (tm). And there are other projects higher on the priority queue.
However, note that I also use OOP. No inheritance (death to gobject!), but the whole thing is based around interface polymorphism. This actually simplifies the design significantly. And you can implement an imgui on top of it pretty easily, if you really like hidden state.
I think there's a fundamental complexity that pervades popular ui libs (incl, qt, gtk, etc.), that doesn't need to be there.