https://bugs.winehq.org/show_bug.cgi?id=23805
--- Comment #4 from JKAbrams j@jkabrams.se --- Further investigation shows that if "Allow the window manager to control the windows" is disabled in Winecfg the window can be maximized/restored without problems. However, the downside is that it does not show up in the taskbar. Is the bug in wine or KDE?