
Keep track of button changes. Send the extended 4-byte messages for three button mice only in case we have something to report for the middle button. Use the short 3-byte messages (original protocol for two-button microsoft mouse) otherwise. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-id: 1467625375-31774-5-git-send-email-kraxel@redhat.com