TrinityCore/TrinityCore — comment on commit 5ea49613d24ad10b305891a39340155058e5a67e
File:  line 0
By e000:

From being a pillar humping paladin on retail during WoTLK, I can say with out a doubt that spells should interrupt when you leave LoS or go out of range. Channeled spells however will continue to cast, unless you leave range.