Bug in describe_undo()?

Hi,

I am setting the undo description before the changes in the slider chang event on my eq helper tool. If I pass the current value to the message, too, strangely it will then display the value of the change before. So if I move the slider to +5, and then to -3, and now doing undo, it will change back to +5, but display “transpose slider to +5 was undone”…