http://bugs.winehq.org/show_bug.cgi?id=3341
------- Additional Comments From lionel.ulmer@free.fr 2005-18-09 14:10 ------- Well, usually people use the DXGrab option to prevent the mouse leaving the game screen. Now I have no idea if this still works in the current Wine tree.
After, I once worked on the 'grabbing desktop' mode stuff but was blocked by severe incompatibilities between how mouse grabbing works in X and how Wine handles X inputs.
So I basically stopped working on it (and as anyway the Desktop stuff will be mostly rewritten 'soon', it's better to wait for this to have happened to then check if something can be done).