g-action-change-state (action value)

action -- a g-action object
value -- a new g-variant state

Request for the state of the action to be changed to value. The action must be stateful and the value argument must be of the correct type. See the g-action-state-type function.

This call merely requests a change. The action may refuse to change its state or may change its state to something other than value. See the g-action-state-hint function.