fix(Core/Players): Removed old and invalid Player::SetInWater funct… (#9739)

* fix(Core/Players): Removed old and invalid `Player::SetInWater` function.

Updates #8729

* buildfix.

src/server/game/Entities/Player/Player.cpp

@@ -235,7 +235,6 @@ Player::Player(WorldSession* session): Unit(true), m_mover(this)
 
     m_MirrorTimerFlags = UNDERWATER_NONE;
     m_MirrorTimerFlagsLast = UNDERWATER_NONE;
-    m_isInWater = false;
     m_drunkTimer = 0;
     m_deathTimer = 0;
     m_deathExpireTime = 0;
@@ -2091,24 +2090,6 @@ bool Player::IsFalling() const
     return GetPositionZ() < m_lastFallZ && !IsInFlight();
 }
 
-void Player::SetInWater(bool apply)
-{
-    if (m_isInWater == apply)
-        return;
-
-    //define player in water by opcodes
-    //move player's guid into HateOfflineList of those mobs
-    //which can't swim and move guid back into ThreatList when
-    //on surface.
-    //TODO: exist also swimming mobs, and function must be symmetric to enter/leave water
-    m_isInWater = apply;
-
-    // remove auras that need water/land
-    RemoveAurasWithInterruptFlags(apply ? AURA_INTERRUPT_FLAG_NOT_ABOVEWATER : AURA_INTERRUPT_FLAG_NOT_UNDERWATER);
-
-    getHostileRefMgr().updateThreatTables();
-}
-
 bool Player::IsInAreaTriggerRadius(const AreaTrigger* trigger) const
 {
     static const float delta = 5.0f;

src/server/game/Entities/Player/Player.h

@@ -1085,9 +1085,6 @@ public:
 
     static bool BuildEnumData(PreparedQueryResult result, WorldPacket* data);
 
-    void SetInWater(bool apply);
-
-    [[nodiscard]] bool IsInWater() const override { return m_isInWater; }
     [[nodiscard]] bool IsFalling() const;
     bool IsInAreaTriggerRadius(const AreaTrigger* trigger) const;
 
@@ -2915,7 +2912,6 @@ private:
     int32 m_MirrorTimer[MAX_TIMERS];
     uint8 m_MirrorTimerFlags;
     uint8 m_MirrorTimerFlagsLast;
-    bool m_isInWater;
 
     // Current teleport data
     WorldLocation teleportStore_dest;

src/server/game/Entities/Unit/Unit.cpp

@@ -3790,10 +3790,13 @@ bool Unit::isInAccessiblePlaceFor(Creature const* c) const
             return false;
     }
 
-    if (IsInWater())
+    // In water or jumping in water
+    if (IsInWater() || (GetLiquidData().Status == LIQUID_MAP_ABOVE_WATER && (IsFalling() || (ToPlayer() && ToPlayer()->IsFalling()))))
+    {
         return IsUnderWater() ? c->CanEnterWater() : (c->CanEnterWater() || c->CanFly());
-    else
-        return c->CanWalk() || c->CanFly() || (c->CanSwim() && IsInWater());
+    }
+
+    return c->CanWalk() || c->CanFly() || (c->CanSwim() && IsInWater());
 }
 
 void Unit::ProcessPositionDataChanged(PositionFullTerrainStatus const& data)