[Bug 43723] New: Unreliable mouse grabbing in dinput

https://bugs.winehq.org/show_bug.cgi?id=43723

Bug ID: 43723
           Summary: Unreliable mouse grabbing in dinput
           Product: Wine
           Version: 2.17
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-dinput
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: SUSE

This issue mostly affects games based on Unreal Engine 3.

Mouse grabbing does not work reliably in those games. In some titles (e.g.
Mirror’s Edge), it is possible to get the mouse to grab by switching to
fullscreen and back using window manager shortcuts *before* starting a game
(exiting the menu). In other titles (e.g. Rainbow Six: Vegas 2), this does not
work.

The usual hacks (MouseWarpOverride=force, or the force_edge variant of it)
break mouse input in menus and cause very juddery (unplayable) input in-game.

However, disabling window manager control in winecfg makes it work as expected.

I am unsure which Wine component really is affected here so I selected dinput.

#6971 is a semi-related bug, but I reckon the cause is very different in this
case.

This issue can be reproduced with at least i3 and KWin, so I assume it is not a
WM bug.