Note: Modifier keys (as defined in #GstNavigationModifierType)
press and
release events are generated even if those states are
present on all other related events
A pointer to a location to receive
the string identifying the key press. The returned string is owned by the
event, and valid only until the event is unreffed.
Note: Modifier keys (as defined in #GstNavigationModifierType) press and release events are generated even if those states are present on all other related events