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Fixed #19816 -- Pre-evaluate querysets used in direct relation assign…
…ments. Since assignments on M2M or reverse FK descriptors is composed of a `clear()`, followed by an `add()`, `clear()` could potentially affect the value of the assigned queryset before the `add()` step; pre-evaluating it solves the problem. This patch fixes the issue for ForeignRelatedObjectsDescriptor, ManyRelatedObjectsDescriptor, and ReverseGenericRelatedObjectsDescriptor. It completes 6cb6e1 which addressed ReverseManyRelatedObjectsDescriptor.
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