This patch is for anonymous cvs.

This fixes following problems.
  1. When gtk+ is compiled with --with-xinput feature, and input device is
     not powered on, X io error occurs.
  2. In my X environment, Shift + Tab produces the keysym XK_ISO_Left_Tab.
     Gtk only expects for XK_Tab, so focus does not move backward.


                                  -Takashi Matsuda
                                   matsu@arch.comp.kyutech.ac.jp