[Gtkradiant] How to add a patch to current selected items in code?

[EvilTypeGuy]

I've done some digging through pmesh.cpp and other places, but I can't
seem to figure out the right way to mark a patch as having been
selected. I've tried setting the bSelected flag to true, I've tried
Brush_Add_To_list( b, &selected_brushes) neither of which seemed to work
and one which caused a crash.

This is part of what I was trying to do for bug 505.

What am I missing?

Thanks,
-- 
EvilTypeGuy <eviltypeguy@qeradiant.com>