Fix compability with some servers fly systems

src/otclient/game.cpp

@@ -481,10 +481,9 @@ void Game::walk(Otc::Direction direction)
             Position pos = toPos;
             if(!pos.down())
                 return false;
-            toTile = g_map.getTile(pos);
-            if(toTile && toTile->hasElevation(3)) {
+            TilePtr toTile = g_map.getTile(pos);
+            if(toTile && toTile->hasElevation(3))
                 return true;
-            }
             return false;
         };
 
@@ -496,13 +495,14 @@ void Game::walk(Otc::Direction direction)
             Position pos = toPos;
             if(!pos.up())
                 return false;
-            toTile = g_map.getTile(pos);
+            TilePtr toTile = g_map.getTile(pos);
             if(!toTile || !toTile->isWalkable())
                 return false;
             return true;
         };
 
-        if(canChangeFloorDown() || canChangeFloorUp()) {
+        if(canChangeFloorDown() || canChangeFloorUp() ||
+            (!toTile || toTile->isEmpty())) {
             m_localPlayer->lockWalk();
         } else
             return;

src/otclient/mapview.cpp

@@ -312,7 +312,7 @@ void MapView::updateVisibleTilesCache(int start)
                     tilePos.coveredUp(cameraPosition.z - iz);
                     if(const TilePtr& tile = g_map.getTile(tilePos)) {
                         // skip tiles that have nothing
-                        if(tile->isEmpty())
+                        if(!tile->isDrawable())
                             continue;
                         // skip tiles that are completely behind another tile
                         if(g_map.isCompletelyCovered(tilePos, m_cachedFirstVisibleFloor))
@@ -366,7 +366,7 @@ void MapView::updateVisibleTilesCache(int start)
                 Position tilePos = cameraPosition.translated(p.x - m_virtualCenterOffset.x, p.y - m_virtualCenterOffset.y);
                 tilePos.coveredUp(cameraPosition.z - iz);
                 if(const TilePtr& tile = g_map.getTile(tilePos)) {
-                    if(!tile->isEmpty())
+                    if(tile->isDrawable())
                         m_cachedVisibleTiles.push_back(tile);
                 }
             }

src/otclient/protocolgame.cpp

@@ -60,12 +60,15 @@ void ProtocolGame::onRecv(const InputMessagePtr& inputMessage)
 {
     if(m_firstRecv) {
         m_firstRecv = false;
+
+        if(g_game.getClientVersion() > 810) {
             int size = inputMessage->getU16();
             if(size != inputMessage->getUnreadSize()) {
                 g_logger.traceError("invalid message size");
                 return;
             }
         }
+    }
 
     parseMessage(inputMessage);
     recv();

src/otclient/tile.cpp

@@ -504,6 +504,11 @@ bool Tile::isEmpty()
     return m_things.size() == 0;
 }
 
+bool Tile::isDrawable()
+{
+    return !m_things.empty() || !m_walkingCreatures.empty() || !m_effects.empty();
+}
+
 bool Tile::mustHookEast()
 {
     for(const ThingPtr& thing : m_things)

src/otclient/tile.h

@@ -98,6 +98,7 @@ public:
     bool isLookPossible();
     bool isClickable();
     bool isEmpty();
+    bool isDrawable();
     bool mustHookSouth();
     bool mustHookEast();
     bool hasCreature();