Function
GioActionname_is_valid
since: 2.38
Description
Checks if action_name is valid.
action_name is valid if it consists only of alphanumeric characters,
plus ‘-‘ and ‘.’. The empty string is not a valid action name.
It is an error to call this function with a non-utf8 action_name.
action_name must not be NULL.
Available since: 2.38