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legacy: Allow ES6 classes to inherit from abstract Lang.Class class

Florian Müllner requested to merge fmuellner/gjs:abstract-inheritance into master

Currently Lang.Class uses a distinct constructor for abstract classes, which just throws when instantiated. This works as Lang.Class classes chain up to _init rather than the real constructor, which isn't the case for ES6 classes. In order to allow ES6 classes to directly inherit from an abstract Lang.Class class, check whether an abstract class has been instantiated directly inside the regular constructor.

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