[10992] Add CastSpell part of dummy effect for spell 23138

Also limit max targets.

Signed-off-by: NoFantasy <nofantasy@nf.no>

src/game/Spell.cpp

@@ -1483,6 +1483,7 @@ void Spell::SetTargetMap(SpellEffectIndex effIndex, uint32 targetMode, UnitList&
         {
             switch(m_spellInfo->Id)
             {
+                case 23138:                                 // Gate of Shazzrah
                 case 31347:                                 // Doom TODO: exclude top threat target from target selection
                 case 33711:                                 // Murmur's Touch
                 case 38794:                                 // Murmur's Touch (h)

src/game/SpellEffects.cpp

@@ -1027,6 +1027,18 @@ void Spell::EffectDummy(SpellEffectIndex eff_idx)
                     m_caster->CastSpell(m_caster, 13166, true, m_CastItem);
                     return;
                 }
+                case 23138:                                 // Gate of Shazzrah
+                {
+                    if (!unitTarget)
+                        return;
+
+                    // Effect probably include a threat change, but it is unclear if fully
+                    // reset or just forced upon target for teleport (SMSG_HIGHEST_THREAT_UPDATE)
+
+                    // Gate of Shazzrah
+                    m_caster->CastSpell(unitTarget, 23139, true);
+                    return;
+                }
                 case 23448:                                 // Transporter Arrival - Ultrasafe Transporter: Gadgetzan - backfires
                 {
                     int32 r = irand(0, 119);

src/shared/revision_nr.h

@@ -1,4 +1,4 @@
 #ifndef __REVISION_NR_H__
 #define __REVISION_NR_H__
- #define REVISION_NR "10991"
+ #define REVISION_NR "10992"
 #endif // __REVISION_NR_H__