Sets the state of the action.
This directly updates the ‘state’ property to the given value.
This should only be called by the implementor of the action. Users
of the action should not attempt to directly modify the ‘state’
property. Instead, they should call
request the change.
value GVariant is floating, it is consumed.
Available since: 2.30
GVariantfor the state.
The data is owned by the caller of the method.