Paper/patches/server/0652-Prevent-softlocked-end-exit-portal-generation.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Noah van der Aa <ndvdaa@gmail.com>
Date: Mon, 30 Aug 2021 15:22:18 +0200
Subject: [PATCH] Prevent softlocked end exit portal generation


diff --git a/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java b/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
index 5b14d63e7c354cd51d67ddc045cc86a0f7b36811..2d74efff30c93ba664cf8dbf20e47dcdbd767d3f 100644
--- a/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
+++ b/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
@@ -466,6 +466,11 @@ public class EndDragonFight {
             }
         }
 
+        // Paper start - Prevent "softlocked" exit portal generation
+        if (this.portalLocation.getY() <= this.level.getMinBuildHeight()) {
+            this.portalLocation = this.portalLocation.atY(this.level.getMinBuildHeight() + 1);
+        }
+        // Paper end - Prevent "softlocked" exit portal generation
         if (worldgenendtrophy.place(FeatureConfiguration.NONE, this.level, this.level.getChunkSource().getGenerator(), RandomSource.create(), this.portalLocation)) {
             int i = Mth.positiveCeilDiv(4, 16);