Add PRE_SERVER_JOIN to DisconnectEvent#LoginStatus (#346)

api/src/main/java/com/velocitypowered/api/event/connection/DisconnectEvent.java

@@ -2,6 +2,7 @@ package com.velocitypowered.api.event.connection;
 
 import static com.velocitypowered.api.event.connection.DisconnectEvent.LoginStatus.CANCELLED_BY_PROXY;
 import static com.velocitypowered.api.event.connection.DisconnectEvent.LoginStatus.CONFLICTING_LOGIN;
+import static com.velocitypowered.api.event.connection.DisconnectEvent.LoginStatus.PRE_SERVER_JOIN;
 import static com.velocitypowered.api.event.connection.DisconnectEvent.LoginStatus.SUCCESSFUL_LOGIN;
 
 import com.google.common.base.Preconditions;
@@ -59,6 +60,7 @@ public final class DisconnectEvent {
     CONFLICTING_LOGIN,
     CANCELLED_BY_USER,
     CANCELLED_BY_PROXY,
-    CANCELLED_BY_USER_BEFORE_COMPLETE
+    CANCELLED_BY_USER_BEFORE_COMPLETE,
+    PRE_SERVER_JOIN
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -695,8 +695,12 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
 
     DisconnectEvent.LoginStatus status;
     if (connectedPlayer.isPresent()) {
+      if (!connectedPlayer.get().getCurrentServer().isPresent()) {
+        status = LoginStatus.PRE_SERVER_JOIN;
+      } else {
         status = connectedPlayer.get() == this ? LoginStatus.SUCCESSFUL_LOGIN
             : LoginStatus.CONFLICTING_LOGIN;
+      }
     } else {
       status = connection.isKnownDisconnect() ? LoginStatus.CANCELLED_BY_PROXY :
           LoginStatus.CANCELLED_BY_USER;