Fixes #420 fixed out-of-range group member's position update, which broken after 7014f421c8

--HG--
branch : trunk

src/game/Player.cpp

@@ -5987,22 +5987,17 @@ bool Player::SetPosition(float x, float y, float z, float orientation, bool tele
     //    mover->RemoveAurasWithInterruptFlags(AURA_INTERRUPT_FLAG_TURNING);
     //AURA_INTERRUPT_FLAG_JUMP not sure
 
-    bool move2d = (teleport || GetPositionX() != x || GetPositionY() != y);
+    // group update
+    if (GetGroup())
+        SetGroupUpdateFlag(GROUP_UPDATE_FLAG_POSITION);
 
-    if (move2d || GetPositionZ() != z)
-    {
-        // group update
-        if (move2d && GetGroup())
-            SetGroupUpdateFlag(GROUP_UPDATE_FLAG_POSITION);
+    // code block for underwater state update
+    UpdateUnderwaterState(GetMap(), x, y, z);
 
-        // code block for underwater state update
-        UpdateUnderwaterState(GetMap(), x, y, z);
+    if(GetTrader() && !IsWithinDistInMap(GetTrader(), INTERACTION_DISTANCE))
+        GetSession()->SendCancelTrade();
 
-        if(GetTrader() && !IsWithinDistInMap(GetTrader(), INTERACTION_DISTANCE))
-            GetSession()->SendCancelTrade();
-
-        CheckExploreSystem();
-    }
+    CheckExploreSystem();
 
     return true;
 }

src/game/Unit.cpp

@@ -15943,7 +15943,7 @@ bool Unit::SetPosition(float x, float y, float z, float orientation, bool telepo
     if ((relocated || turn) && IsVehicle())
         GetVehicleKit()->RelocatePassengers(x,y,z,orientation);
 
-    return true;
+    return (relocated || turn);
 }
 
 void Unit::SendThreatListUpdate()

src/game/Unit.h

@@ -1426,6 +1426,7 @@ class TRINITY_DLL_SPEC Unit : public WorldObject
 
         void NearTeleportTo(float x, float y, float z, float orientation, bool casting = false);
         virtual bool SetPosition(float x, float y, float z, float ang, bool teleport = false);
+        // returns true if unit's position really changed
         bool SetPosition(const Position &pos, bool teleport = false) { return SetPosition(pos.GetPositionX(), pos.GetPositionY(), pos.GetPositionZ(), pos.GetOrientation(), teleport); }
 
         void KnockbackFrom(float x, float y, float speedXY, float speedZ);