http://bugs.winehq.org/show_bug.cgi?id=58167
--- Comment #25 from Jonas winehq@jonass.user.lysator.liu.se --- (In reply to Jonas from comment #24)
(In reply to Rémi Bernon from comment #22)
I believe this should work better after f5944829dc8620b48f8ebde59a9ee8a7734a7f8d, could you confirm?
Unfortunately not completely resolved.
However, maybe, I found another clue: Besides Pegasus Mail I also got a couple of xfce4-terminal windows. If I minimize Pegasus and then click *inside* the third terminal, Pegasus usually stays minimized, even when I click in other windows afterwards. Maybe 9 out 10 times, or something like that. But if I click on the title bar or any other window, Pegasus is restored.
Tested with wine-10.20, have not been able to check if that correction is included.