https://bugs.winehq.org/show_bug.cgi?id=42675
--- Comment #29 from Cooper Wallace cooper.wallace5@gmail.com --- I've been playing Overwatch once again and I've noticed that phantom mouse movements are tied to the resolution of the game window. Something that I noticed was that when I resize the screen to not be exactly 21:9, I experience phantom mouse movements. I'm able to move my window until I get my cursor "centered", but the moment that I open the menu or chat the phantom mouse is back.
I curiously tried to resize the window pixel by pixel (using i3wm hotkeys), and I noticed that when windows is resized so that there are black bars I have phantom mouse movements. I feel like this may be because the window is no longer in a 21:9 aspect ratio. I was able to eliminate the mouse movements by resizing the window to not have any black bars, and be within the 21:9 aspect ratio. If I move the window the phantom mouse movements do come back, but opening the menu and closing it appears to fix it.
I guess that the window itself isn't adhering to the aspect ratio, and when I have black bars on all sides the aspect ratio isn't 'perfect'. Resizing it to be proper eliminates the problem for me.