[issue871] gtk2 related: X mouse pointer jumps and sticks to top left corner

[Matthew Dillon]

:Also, just now I managed to get my mouse stuck to the far top-left corner. USB
:mouse and X was using sysmouse.

    I don't know what else can be done on the OS side.  When I look at the
    floating point save area on the stack from firefox dumps, it contains
    total garbage.  I think firefox and/or gtk is munging the stack somewhere.

    I think the changes are worth comitting since this is what other OSes are
    doing, we'll just have to work from this base to resolve the remaining
    issues.

						-Matt