Relative mouse is mode broken for various X11 legacy applications like netradiant (latest version from https://gitlab.com/xonotic/netradiant ), or Sims 4's character creator in wine, .. What happens is that it feels like the application takes the mouse cursor position difference to the center of the window, but then doesn't reset the mouse to the center after each frame. The result is, that as soon as the user dares moving the mouse, the relative mouse movement "shoots" heavily into that direction like falling off a cliff and it's basically always going into that direction even if the mouse is moved into the other, unless the user reverses by a long distance. It's basically unusable. All the affected applications work fine in wine.
Which version of Xwayland are you using, on which version of which Wayland compositor?
The compositor is GNOME shell 3.24.2, the X server is X.Org X Server 1.19.3-4.fc26 and Xwayland is 1.19.3-4.fc26.
Also affects some games/apps running in proton https://github.com/ValveSoftware/proton . Going back to an Xorg session fixes it.
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