support horisontal mouse wheel
This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/584155
Brad Jorsch provided a series of patches to support horisontal mouse scrolling in qemu-emulated mouse. See Debian bug#579968 -- http://bugs.debian.org/cgi- bin/bugreport.cgi?bug=579968 and submission to qemu-devel list at http://www.mail-archive.com/qemu-devel@nongnu.org/msg30991.html .