https://bugs.winehq.org/show_bug.cgi?id=36854
--- Comment #19 from Ken Thomases ken@codeweavers.com --- (In reply to Karol Herbst from comment #18)
Created attachment 49453 [details] little patch to fix this issue
this fixed it for me, but I don't know if this is right.
It's not right. It turns dead keys into normal keys that just produce a character. Of course, that breaks an important feature of keyboard layouts.