the #GdkDisplay
a #GdkWindow or null to indicate that the owner for the given should be unset
an atom identifying a selection
timestamp to use when setting the selection If this is older than the timestamp given last time the owner was set for the given selection, the request will be ignored
if true, and the new owner is different from the current owner, the current owner will be sent a SelectionClear event
true if the selection owner was successfully changed to owner, otherwise false.
Sets the #GdkWindow owner as the current owner of the selection selection.