TrinityCore/TrinityCore — pull request #3596 by ille (2011-10-20 16:45:51+00:00)
Title: use effectMask to calculate mechanicMask in ModSpellDuration

only target affecting effects should go into calculation of duration
fixes spellduration for spells with effects on caster and target, with same mechanic as applied auras with effects SPELL_AURA_MECHANIC_DURATION_MOD, SPELL_AURA_MECHANIC_DURATION_MOD_NOT_STACK
ex. Mind Flay - Da Voodoo Shuffle