workaround for bug 1064351?

Hi,

I was wondering if anyone knew a workaround for bug 1064351
(https://sourceforge.net/tracker/?func=detail&aid=1064351&group_id=9863&atid=109863).

I was hoping that a fix would have made it to 2.5.4.1 (Kudos for that one by the way!) which solved a lot of other issues.
I really need to upgrade from 2.5.2.8, where listing open MDI child windows still worked "automagically".

Any pointers much appreciated.

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Vincent Wehren