https://bugs.winehq.org/show_bug.cgi?id=31245
--- Comment #28 from CommonOddity EtherealTouch@gmail.com --- That depends on your perspective... If you're looking at the original client prior to the post Warcraft 3 reforged re-work? The issue appeared to persist last time I ran it.
Mind you, that was 2 years ago and quite a few wine versions ago (I believe out of the 4.x series branch? I can't recall the exact version).
Post Warcraft 3 reforged re-work? Nope. The client behaves as it should. Resolutions and alt-tabbing are no longer an issue, really. It works well.