https://bugs.winehq.org/show_bug.cgi?id=8365
--- Comment #30 from Erich Hoover erich.e.hoover@gmail.com --- (In reply to Goblinstomper from comment #29)
... So, I guess it is possible that the prolonged alt-tab at step 4 fulfilled the same 'alt stuck' behavior you encountered?
Could be, it also could be that (for some reason) the issue is not present when you are in fullscreen mode or that the keypress you tested was not sensitive to having the Alt key pressed. I suspect that when the Alt key is "stuck" that there are some operations that behave in unexpected ways.