I hope too.
I don't actually use Lazarus any more, but I applied the 31013 patch to 1.6.4 and compiled an old project that has a list box that demonstrates the bug. Appears to work fine now. Nice contribution.
Note that this demonstrates the important role of a list box not only as a selection control, but as a way of showing a control's current value in the context of the list all possible values. Very handy.
Edit: Appears as though gtk2 widgetset has the same list box bug. How odd. Works fine with win32 widgetset, though.