sync code with last improvements from OpenBSD

lib/libXi/man/XChangeKeyboardDevice.txt

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+XCHANGEKEYBOARDDEVICE(libmansuffix)
+===================================
+
+NAME
+----
+
+   XChangeKeyboardDevice - change which device is used as the X
+   keyboard
+
+SYNOPSIS
+--------
+
+   #include <X11/extensions/XInput.h>
+
+   Status XChangeKeyboardDevice( Display *display,
+                                 XDevice *device);
+
+   display
+          Specifies the connection to the X server.
+
+   device
+          Specifies the device to be used as the X keyboard.
+
+DESCRIPTION
+-----------
+
+   The XChangeKeyboardDevice request causes the server to use the
+   specified device as the X keyboard. The device must have been
+   previously opened by the requesting client via XOpenDevice or a
+   BadDevice error will result. The device must support input
+   class Keys, or a BadMatch error will result. If the server
+   implementation does not support using the requested device as
+   the X keyboard, a BadDevice error will result.
+
+   If the specified device is grabbed by another client,
+   AlreadyGrabbed is returned. If the specified device is frozen
+   by a grab on another device, GrabFrozen is returned. If the
+   request is successful, Success is returned.
+
+   If the request succeeds, a ChangeDeviceNotify event is sent to
+   all clients that have selected that event. A MappingNotify
+   event with request = MappingKeyboard is sent to all clients.
+   The specified device becomes the X keyboard and the old X
+   keyboard becomes accessible through the input extension
+   protocol requests.
+
+   XChangeKeyboardDevice can generate a BadDevice or a BadMatch
+   error.
+
+DIAGNOSTICS
+-----------
+
+   BadDevice
+          An invalid device was specified. The specified device
+          does not exist, has not been opened by this client via
+          XOpenInputDevice, or is already one of the core X device
+          (pointer or keyboard). This error may also occur if the
+          server implementation does not support using the
+          specified device as the X keyboard.
+
+   BadMatch
+          This error may occur if an XChangeKeyboardDevice request
+          was made specifying a device that has no keys.
+
+SEE ALSO
+--------
+
+   XChangePointerDevice(libmansuffix)