[FIXED] [Multiple] Spells vs LoS @ Arena corners

[Dreadblade]

WoW Freakz spell link: N/A, absolutely any spell that requires a target, whether hostile or friendly. Mostly instant cast spells with no travel time.
Bug description: It happens very often that spells have no effect due to some strange delay which registers the players as no longer being within Line of Sight (at least, that's what I assume is happening). For example, I use Holy Shock while my target is within Line of Sight, but in the next milisecond he moves out of LoS and holy shock had absolutely no effect. Yet I still got a cooldown on the spell. This is an older issue that's been around since 4.3.

The bug is harder to reproduce, but I managed to record a few instances of it happening in Nagrand arena, while my target was moving very quickly, strafing left and right near the edge of the pillar.
Tested it with a Paladin because they have many instant spells on a short cooldown, but the bug can virtually happen with any class or spell.
Proof: https://youtube.com/watch?v=AwGeiujXY1g:

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Overall I've managed to record the bug happening 12 times in the video, as follows:

0:02 Judgement
0:24 Judgement
0:26 Holy Shock
0:31 Judgement
0:34 Holy Shock
0:36 Holy Prism
0:49 Judgement
1:04 Judgement
1:48 Holy Shock
2:00 Judgement
2:04 Fist of Justice
2:07 Holy Shock

[Vvtf]

1:33 Polymorph on pillar, on retail happen 2, you clearly see the cast is full casted and not interrupted

https://youtube.com/watch?v=SdgGx4J-dXI:

[Shocker]

Vvtf, although you may be right in the video you posted, on our server we really had an issue with LoS/corners, original bug report https://forum.wow-freakz.com/Multiple-Spells-Attacks-and-many-others-vs-Arenas-BGS-more-t211526.html
I finally managed to reproduce it and find the reason, fixed.

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