Bug: output window of wxMaxima is not visible



The bug is described here
https://bugzilla.redhat.com/show_bug.cgi?id=455863

I suspect that MathCtrl.cpp sets the visible rectangle badly
as when it's running in right to left local 0,0 is the right top corner

please fix that, I think it would be easy
(my experience is in GTK+ I can't help you with xw)