Core/Unit: rename IsFocusing method

Port From (https://github.com/TrinityCore/TrinityCore/commit/be4ed9152c1a9c3dab9949eb36d867b763603f60)

Source/Game/AI/CoreAI/CreatureAI.cs

@@ -254,7 +254,7 @@ namespace Game.AI
             {
                 Unit victim = me.SelectVictim();
                 if (victim != null)
-                    if (!me.IsFocusing(null, true) && victim != me.GetVictim())
+                    if (!me.HandleSpellFocus(null, true) && victim != me.GetVictim())
                         AttackStart(victim);
 
                 return me.GetVictim() != null;

Source/Game/Entities/Creature/Creature.cs

@@ -532,7 +532,7 @@ namespace Game.Entities
 
                     GetThreatManager().Update(diff);
 
-                    if (m_shouldReacquireTarget && !IsFocusing(null, true))
+                    if (m_shouldReacquireTarget && !HandleSpellFocus(null, true))
                     {
                         SetTarget(m_suppressedTarget);
 
@@ -932,7 +932,7 @@ namespace Game.Entities
 
             if (target && _IsTargetAcceptable(target) && CanCreatureAttack(target))
             {
-                if (!IsFocusing(null, true))
+                if (!HandleSpellFocus(null, true))
                     SetInFront(target);
                 return target;
             }
@@ -1121,7 +1121,7 @@ namespace Game.Entities
                             return true;
             }
 
-            if (IsFocusing(null, true))
+            if (HandleSpellFocus(null, true))
                 return true;
 
             if (HasUnitState(UnitState.Casting))
@@ -2919,7 +2919,7 @@ namespace Game.Entities
 
         public override void SetTarget(ObjectGuid guid)
         {
-            if (IsFocusing(null, true))
+            if (HandleSpellFocus(null, true))
                 m_suppressedTarget = guid;
             else
                 SetUpdateFieldValue(m_values.ModifyValue(m_unitData).ModifyValue(m_unitData.Target), guid);
@@ -2953,7 +2953,7 @@ namespace Game.Entities
                 return;
 
             // store pre-cast values for target and orientation (used to later restore)
-            if (!IsFocusing(null, true))
+            if (!HandleSpellFocus(null, true))
             { // only overwrite these fields if we aren't transitioning from one spell focus to another
                 m_suppressedTarget = GetTarget();
                 m_suppressedOrientation = GetOrientation();
@@ -3001,7 +3001,7 @@ namespace Game.Entities
                 AddUnitState(UnitState.Focusing);
         }
 
-        public override bool IsFocusing(Spell focusSpell = null, bool withDelay = false)
+        public override bool HandleSpellFocus(Spell focusSpell = null, bool withDelay = false)
         {
             if (!IsAlive()) // dead creatures cannot focus
             {

Source/Game/Entities/Unit/Unit.Spells.cs

@@ -1041,7 +1041,7 @@ namespace Game.Entities
             return 0;
         }
 
-        public virtual bool IsFocusing(Spell focusSpell = null, bool withDelay = false) { return false; }
+        public virtual bool HandleSpellFocus(Spell focusSpell = null, bool withDelay = false) { return false; }
 
         /// <summary>
         /// Check if our current channel spell has attribute SPELL_ATTR5_CAN_CHANNEL_WHEN_MOVING

Source/Game/Handlers/PetHandler.cs

@@ -327,7 +327,7 @@ namespace Game
                         Unit unit_target2 = spell.m_targets.GetUnitTarget();
                         if (unit_target)
                         {
-                            if (!pet.IsFocusing())
+                            if (!pet.HandleSpellFocus())
                                 pet.SetInFront(unit_target);
                             Player player = unit_target.ToPlayer();
                             if (player)
@@ -335,7 +335,7 @@ namespace Game
                         }
                         else if (unit_target2)
                         {
-                            if (!pet.IsFocusing())
+                            if (!pet.HandleSpellFocus())
                                 pet.SetInFront(unit_target2);
                             Player player = unit_target2.ToPlayer();
                             if (player)

Source/Game/Spells/Spell.cs

@@ -3998,7 +3998,7 @@ namespace Game.Spells
                     {
                         Creature creatureCaster = unitCaster.ToCreature();
                         if (creatureCaster != null)
-                            if (!creatureCaster.IsFocusing(this))
+                            if (!creatureCaster.HandleSpellFocus(this))
                                 creatureCaster.FocusTarget(this, Global.ObjAccessor.GetWorldObject(creatureCaster, target.TargetGUID));
                     }
                 }