Large ComboBox bug fixed?

I wrote:

I've got a drop-down combo-box with >= 2048 items which doesn't
display the drop down properly (it's just a thin line) if I run
in my "stable" environment -- wxPython 2.4.2.4+GTK1.2. It *is*
working properly in my "experimental" environment -- wxPython
2.5.1.5+GTK2.0. I can't find a reference to this issue in the
wx bug tracker. I'm guessing it's really a GTK1.2 problem (MSW
works OK too)

I'm now in a position to confirm that this is indeed a GTK1.2
problem, having set up a wxPython2.5.2.8+GTK1.2 environment.

Now to try and nail down the remaining items I've determined *are*
wx2.5 issues rather than a GTK2 ones.