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XWayland: Erratic mouse behavior with Wine/World of Warcraft due to warp emulation

After switching from i3 to swaywm, World of Warcraft under Wine got a weird behavior : clicking almost anywhere in the window (except things like buttons) would move the mouse pointer to the center of the screen.

After digging a bit I was able to reproduce the issue. Schematically, the game is doing something close to this :

OnMouseButtonPressed(): 
  HideCursor()
  SaveCurrentCoordinates()
  WarpToWindowCenter()

OnMouseButtonRelease()
  ShowCursor()
  WarpToSavedCoordinates()

I have attached a X program that reproduces the issue : warp_test.c

The root of the issue is that XWarpPointer() in XWayland only works when the mouse is hidden. Allowing XWarpPointer() when the mouse is visible, as illustrated in always-warp.diff, fixes the issue.

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