It seems the bug got fixed upstream (wine).
Users may install latest Winehq version of Wine to work around the problem.
See http://www.winehq.org/site/download-deb for instructions.
The bug thread in Wine bugzilla will be closed soon (I have been told).
I will mark the bug invalid for Ubuntu package pq.
The bug will remains a bug for Ubuntu package wine.
** Changed in: pq (Ubuntu)
Status: New => Invalid
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main window disappears from the Window list
https://bugs.launchpad.net/bugs/237300
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