Action.unblockActivateFrom

Warning gtk_action_unblock_activate_from has been deprecated since version 2.16 and should not be used in newly-written code. activatables are now responsible for activating the action directly so this doesnt apply anymore. Re-enables calls to the gtk_action_activate() function by signals on the given proxy widget. This undoes the blocking done by gtk_action_block_activate_from(). This function is intended for use by action implementations. Since 2.4