Migrate Carpet Mixin names to mojang mappings

src/main/java/carpet/mixins/PlayerList_fakePlayersMixin.java

@@ -0,0 +1,47 @@
+package carpet.mixins;
+
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.Connection;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.server.network.ServerGamePacketListenerImpl;
+import net.minecraft.server.players.PlayerList;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import carpet.patches.NetHandlerPlayServerFake;
+import carpet.patches.EntityPlayerMPFake;
+
+@Mixin(PlayerList.class)
+public abstract class PlayerList_fakePlayersMixin
+{
+    @Shadow
+    @Final
+    private MinecraftServer server;
+
+    @Inject(method = "load", at = @At(value = "RETURN", shift = At.Shift.BEFORE))
+    private void fixStartingPos(ServerPlayer serverPlayerEntity_1, CallbackInfoReturnable<CompoundTag> cir)
+    {
+        if (serverPlayerEntity_1 instanceof EntityPlayerMPFake)
+        {
+            ((EntityPlayerMPFake) serverPlayerEntity_1).fixStartingPosition.run();
+        }
+    }
+
+    @Redirect(method = "placeNewPlayer", at = @At(value = "NEW", target = "net/minecraft/server/network/ServerGamePacketListenerImpl"))
+    private ServerGamePacketListenerImpl replaceNetworkHandler(MinecraftServer server, Connection clientConnection, ServerPlayer playerIn)
+    {
+        if (playerIn instanceof EntityPlayerMPFake fake)
+        {
+            return new NetHandlerPlayServerFake(this.server, clientConnection, fake);
+        }
+        else
+        {
+            return new ServerGamePacketListenerImpl(this.server, clientConnection, playerIn);
+        }
+    }
+}