https://bugs.winehq.org/show_bug.cgi?id=38633
--- Comment #4 from Béla Gyebrószki gyebro69@gmail.com --- Still present in 1.8-rc1, tested with Nvidia binary drivers 340.96 and Nouveau/Mesa git. Keep pressing a key (instead of moving the mouse) also works around the problem.
Fedora 23 xorg-x11-server-Xorg-1.18.0-2.fc23.i686