XSelectionEvent - SelectionNotify event structure
The structure for SelectionNotify events contains:
typedef struct {
int type; SelectionNotify
unsigned long serial; # of last request processed by server
Bool send_event; true if this came from a SendEvent request
Display *display; Display the event was read from
Window requestor;
Atom selection;
Atom target;
Atom property; atom or None
Time time;
} XSelectionEvent;