Xnest: set the default pointer accel to the host's values (#10013)

The defaultPointerControl holds compile-time defaults for pointer
acceleration. If an Xnest instance is started, it resets the hosts pointer
accel values to these built-in defaults instead of using the host values.

This patch queries the host for the values before initializing the device,
thus leaving the host values untouched.

X.Org Bug 10013 <http://bugs.freedesktop.org/show_bug.cgi?id=10013>

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

hw/xnest/Pointer.c

@@ -72,6 +72,10 @@ xnestPointerProc(DeviceIntPtr pDev, int onoff)
       axes_labels[0] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_X);
       axes_labels[1] = XIGetKnownProperty(AXIS_LABEL_PROP_REL_Y);
 
+      XGetPointerControl(xnestDisplay,
+                         &defaultPointerControl.num,
+                         &defaultPointerControl.den,
+                         &defaultPointerControl.threshold);
       InitPointerDeviceStruct(&pDev->public, map, nmap, btn_labels,
 			      xnestChangePointerControl,
 			      GetMotionHistorySize(), 2, axes_labels);