https://bugs.winehq.org/show_bug.cgi?id=55027
--- Comment #4 from Masahito S. firelzrd@gmail.com --- I successfully built a patched version on top of 8.10, and ran the same test on it. As much as I tried, now the bad case seems to happen at 100% chance. Certainly the order of the window messages being sent must be this time always opposite. That is a good sign, and we're one more step away from addressing it, aren't we?