>> I can reproduce it here, unfortunately Tcl/Tk 8.5 isn't really supported
>> by Python 2.5 and the changes required to get this fixed won't be
>> backported. It was suggested backporting before and it was rejected.
>
> Thank you for giving an update. Was it reported as a bug in this tracker?
> Do you know the bug number?

It was reported here, yes. I was able to find issue4342 which talks
about this, from what I remember it is r59653 which needed to be
backported but wasn't. There was another issue where I pointed out the
fixes that should be applied if someone wanted to use Tcl/Tk 8.5, with
fewer issues, together with Python 2.5 but right now I don't remember
on which issue I wrote this.