Paper/patches/server/0848-Execute-chunk-tasks-fairly-for-worlds-while-waiting-.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 28 Dec 2021 07:19:01 -0800
Subject: [PATCH] Execute chunk tasks fairly for worlds while waiting for next
 tick

Currently, only the first world would have had tasks executed.
This might result in chunks loading far slower in the nether,
for example.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index b0300d08475b4377e26bd5c9c432b554849b452a..9c215a77ca24ab2c75709c867c1d92ad7c97f1ea 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1312,6 +1312,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.executeMidTickTasks(); // Paper - execute chunk tasks mid tick
             return true;
         } else {
+            boolean ret = false; // Paper - force execution of all worlds, do not just bias the first
             if (this.haveTime()) {
                 Iterator iterator = this.getAllLevels().iterator();
 
@@ -1319,12 +1320,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
                     ServerLevel worldserver = (ServerLevel) iterator.next();
 
                     if (worldserver.getChunkSource().pollTask()) {
-                        return true;
+                        ret = true; // Paper - force execution of all worlds, do not just bias the first
                     }
                 }
             }
 
-            return false;
+            return ret; // Paper - force execution of all worlds, do not just bias the first
         }
     }