https://bugs.winehq.org/show_bug.cgi?id=46245
--- Comment #5 from Sveinar Søpler cybermax@dexter.no --- (In reply to Józef Kucia from comment #4)
Should be fixed by the patch series ending with https://source.winehq.org/git/wine.git/?a=commit; h=0510bca6964a103c5d38d1f5b5eb2a2a72d6a2b9
Seems to work fine switching between vsync on/off in WoW.
Thanks! :)