PathDirection 
    The values of the GskPathDirection enum are used to pick one of the four tangents at a given point on the path.
Note that the directions for @GSK_PATH_FROM_START/@GSK_PATH_TO_END and
Since
4.14
Functions
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.