Change channel transition patch

Solved an issue where players were being unable to return to the game once changing channels.

src/net/MapleServerHandler.java

@@ -150,7 +150,8 @@ public class MapleServerHandler extends IoHandlerAdapter {
         MapleClient client = (MapleClient) session.getAttribute(MapleClient.CLIENT_KEY);
         if (client != null) {
             try {
-                if (!session.containsAttribute(MapleClient.CLIENT_CASH_SHOP)) {
+                // client freeze issues on session transition states found thanks to yolinlin, Omo Oppa, Nozphex
+                if (!session.containsAttribute(MapleClient.CLIENT_TRANSITION)) {
                     client.disconnect(false, false);
                 }
             } catch (Throwable t) {

src/net/server/channel/handlers/EnterCashShopHandler.java

@@ -65,6 +65,7 @@ public class EnterCashShopHandler extends AbstractMaplePacketHandler {
             mc.unregisterChairBuff();
             Server.getInstance().getPlayerBuffStorage().addBuffsToStorage(mc.getId(), mc.getAllBuffs());
             Server.getInstance().getPlayerBuffStorage().addDiseasesToStorage(mc.getId(), mc.getAllDiseases());
+            mc.setSessionTransitionState();
             mc.setAwayFromChannelWorld();
             mc.notifyMapTransferToPartner(-1);
             mc.removeIncomingInvites();

src/net/server/channel/handlers/EnterMTSHandler.java

@@ -91,6 +91,7 @@ public final class EnterMTSHandler extends AbstractMaplePacketHandler {
             chr.unregisterChairBuff();
             Server.getInstance().getPlayerBuffStorage().addBuffsToStorage(chr.getId(), chr.getAllBuffs());
             Server.getInstance().getPlayerBuffStorage().addDiseasesToStorage(chr.getId(), chr.getAllDiseases());
+            chr.setSessionTransitionState();
             chr.setAwayFromChannelWorld();
             chr.notifyMapTransferToPartner(-1);
             chr.removeIncomingInvites();