Andrii Doroshenko (Xrayez) 1f42a8a073 Fix List swap behavior on front, back and adjacent elements ...

- immediately return if A == B;
- first and last elements (front, back) are updated upon relinking;
- handles a special case of forward and backward adjacent elements.

(cherry picked from commit ac69f092fc)

2020-09-24 14:43:07 +02:00

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