XkbChangeDeviceInfo updates the server's description of the device specified in device_info->device_spec with the changes specified in changes and contained in device_info. The update is made by an XkbSetDeviceInfo request.
Changes to an Xkb extension device may be tracked by
listening to XkbDeviceExtensionNotify events and accumulating the changes
in an XkbDeviceChangesRec structure. The changes noted in the structure
may then be used in subsequent operations to update either a server configuration
or a local copy of an Xkb extension device configuration. The changes structure
is defined as follows:
typedef struct _XkbDeviceChanges {
unsigned int changed; /* bits indicating what has changed
*/
unsigned short first_btn; /* number of first button which
changed, if any */
unsigned short num_btns; /* number of buttons that have
changed */
XkbDeviceLedChangesRec leds;
} XkbDeviceChangesRec,*XkbDeviceChangesPtr;