[FIXED] [Death Knight][Spell] Death Grip vs. LoS corners

[Dreadblade]

WoW Freakz spell link: Death Grip
Bug description: Sometimes Death Grip does not work, as in you cast the spell, it goes on cooldown, the animation happens but your target does not get pulled towards you. I'm not exactly sure why this happens yet, but I think it has something to do with either LoS or world geometry. Either way if you successfully cast the spell, your target should get pulled no matter what (unless he's rooted or immune to grip mechanics, but that's not the case here).

I'll keep testing and try to record whenever it happens. If someone else knows more than I do, please post in this topic.

L.E.: Managed to record it eventually.

Proof: https://youtube.com/watch?v=pvNS4t1eqsE:

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Note that in a normal situation, the spell would go on cooldown, but I used the no cooldown cheat for testing.
This bug is very similar to the old Arena LoS / corners bug that got fixed a while ago: https://forum.wow-freakz.com/FIXED-Multiple-Spells-vs-LoS-Arena-corners-t413701.html

[Shocker]

Although I didn't reproduce this, I know what this is about and I made a possible fix, hopefully it will be ok

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