dix: move focus handling into enterleave.c.

This commit moves the focus handling from events.c into enterleave.c and
implements a model similar to the core enter/leave model.
For a full description of the model, see:
http://lists.freedesktop.org/archives/xorg/2008-December/041740.html

This commit also gets rid of the focusinout array in the WindowRec, ditching
it in favour of a local array that keeps the current focus window for each
device.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

include/input.h

@@ -509,8 +509,6 @@ extern _X_EXPORT int AllocMasterDevice(ClientPtr client,
 extern _X_EXPORT void DeepCopyDeviceClasses(DeviceIntPtr from,
                                   DeviceIntPtr to);
 
-extern _X_EXPORT int FocusSemaphoresIsset(WindowPtr win);
-
 /* Implemented by the DDX. */
 extern _X_EXPORT int NewInputDeviceRequest(
     InputOption *options,

include/windowstr.h

@@ -179,11 +179,6 @@ typedef struct _Window {
 #ifdef ROOTLESS
     unsigned		rootlessUnhittable:1;	/* doesn't hit-test */
 #endif
-    /* Used to maintain semantics of core protocol for Enter/LeaveNotifies and
-     * FocusIn/Out events for multiple pointers/keyboards. Each device ID
-     * corresponds to one bit. If set, the device is in the window/has focus.
-     */
-    char                focusinout[(MAXDEVICES + 7)/8];
 } WindowRec;
 
 /*