Gst.PadStickyEventsForeachFunction
Callback used by Gst.Pad.prototype.sticky_events_foreach.
When this function returns true, the next event will be returned. When false is returned, Gst.Pad.prototype.sticky_events_foreach will return.
When event is set to NULL, the item will be removed from the list of sticky events. event can be replaced by assigning a new reference to it. This function is responsible for unreffing the old event when removing or modifying.