handle maximum number of players in kart selection screen

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4912 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/states_screens/kart_selection.cpp

@@ -859,6 +859,13 @@ bool KartSelectionScreen::playerJoin(InputDevice* device, bool firstPlayer)
         return false;
     }
 
+    if (StateManager::get()->activePlayerCount() >= MAX_PLAYER_COUNT)
+    {
+        std::cerr << "Maximum number of players reached\n";
+        sfx_manager->quickSound( "use_anvil" );
+        return false;
+    }
+    
     // ---- Get available area for karts
     // make a copy of the area, ands move it to be outside the screen
     Widget kartsArea = *this->getWidget("playerskarts"); // copy