https://bugs.winehq.org/show_bug.cgi?id=49800
--- Comment #8 from Brian Gerst brgerst@gmail.com --- With this patch and c5ec1585 reverted, switching monitors does work. So the patch is good, it just fixes a different problem. Should I file a separate bug for it?
Unfortunately, this means that there still is an issue with the new WM state handling vs. the MATE window manager.