Area2D with CollisionPolygon2D : How to detect, which Polygon collided, not which sub-shape of the Polygons.

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Footurist
:warning: Old Version Published before Godot 3 was released.

I have an Area2D with 3 CollisionPolygon2D assigned to detect 3 different parts of the Area2D. Now, the problem is : body_shape_entered of Area2D only supplies a shape index called area_shape, to know which shape of all the sub-shapes combined of the CollisionPolygon2Ds collided.
To know which CollisionPolygon2D collided I have to count them and make a relatively complex multi-line If-Clause.

Isn’t there a simpler way to access the actual CollisionPolygon2Ds?

Thanks alot for your patience.
Greetings, Footurist