Core/Spells: Spell casts should be interrupted if the target goes out of LoS.

Signed-off-by: Subv <[email protected]>

src/server/game/Spells/Spell.cpp

@@ -3481,6 +3481,14 @@ void Spell::update(uint32 difftime)
         {
             if (m_timer > 0)
             {
+                // Cancel the cast if the target is not in line of sight
+                if (m_targets.GetUnitTarget() && !m_caster->IsWithinLOSInMap(m_targets.GetUnitTarget()))
+                {
+                    SendCastResult(SPELL_FAILED_LINE_OF_SIGHT);
+                    cancel();
+                    return;
+                }
+
                 if (difftime >= (uint32)m_timer)
                     m_timer = 0;
                 else