Remove "Implement-Chunk-Priority-Urgency-System-for-Chunks" (Fixes #5980)

Mojang made some changes to priorities in 1.17 and it seems that these changes
conflict with the changes made in this patch, which in some cases appears to
cause excessive rescheduling of tasks.

This, however, is not confirmed as such but seems to be the behavior that we're
seeing to cause this issue, if mojang has adopted the changes we suggested,
then a good chunk of this patch may be unneeded, but, this needs a much better
look than I'm currently able to do

patches/server/ChunkMap.mainInvokingExecutor.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sat, 14 Aug 2021 14:49:45 +0100
+Subject: [PATCH] ChunkMap.mainInvokingExecutor
+
+This is a temp patch, this should maybe be moved to a more generic map or potentially wrapped into mcutil for the sake of this being such a generic concept
+anyways
+
+diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
++++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+     public final ServerLevel level;
+     private final ThreadedLevelLightEngine lightEngine;
+     private final BlockableEventLoop<Runnable> mainThreadExecutor;
++    final java.util.concurrent.Executor mainInvokingExecutor; // Paper // Paper - Move to MCUtil?
+     public final ChunkGenerator generator;
+     public final Supplier<DimensionDataStorage> overworldDataStorage;
+     private final PoiManager poiManager;
+@@ -0,0 +0,0 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
+         this.level = world;
+         this.generator = chunkGenerator;
+         this.mainThreadExecutor = mainThreadExecutor;
++        // Paper start
++        this.mainInvokingExecutor = (run) -> {
++            if (MCUtil.isMainThread()) {
++                run.run();
++            } else {
++                mainThreadExecutor.execute(run);
++            }
++        };
++        // Paper end
+         ProcessorMailbox<Runnable> threadedmailbox = ProcessorMailbox.create(executor, "worldgen");
+ 
+         Objects.requireNonNull(mainThreadExecutor);

patches/server/Fix-Entity-Teleportation-and-cancel-velocity-if-tele.patch

@@ -22,14 +22,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              this.lastGoodY = this.awaitingPositionFromClient.y;
              this.lastGoodZ = this.awaitingPositionFromClient.z;
 @@ -0,0 +0,0 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
-         // CraftBukkit end
  
          this.awaitingTeleportTime = this.tickCount;
--        this.player.absMoveTo(d0, d1, d2, f, f1);
+         this.player.absMoveTo(d0, d1, d2, f, f1);
 +        this.player.moveTo(d0, d1, d2, f, f1); // Paper - use proper setPositionRotation for teleportation
-         this.player.forceCheckHighPriority(); // Paper
          this.player.connection.send(new ClientboundPlayerPositionPacket(d0 - d3, d1 - d4, d2 - d5, f - f2, f1 - f3, set, this.awaitingTeleport, flag));
      }
+ 
 diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/entity/Entity.java

patches/server/Improve-Chunk-Status-Transition-Speed.patch

@@ -49,6 +49,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        ChunkAccess chunk = getAvailableChunkNow();
 +        return chunk != null && (status == null || chunk.getStatus().isOrAfter(getNextStatus(status)));
 +    }
++    // Yanked from chunk priotisation patch - remove?
++    public static ChunkStatus getNextStatus(ChunkStatus status) {
++        if (status == ChunkStatus.FULL) {
++            return status;
++        }
++        return CHUNK_STATUSES.get(status.getIndex() + 1);
++    }
 +    // Paper end
  
      public ChunkHolder(ChunkPos pos, int level, LevelHeightAccessor world, LevelLightEngine lightingProvider, ChunkHolder.LevelChangeListener levelUpdateListener, ChunkHolder.PlayerProvider playersWatchingChunkProvider) {

patches/server/Optimize-Light-Engine.patch

@@ -29,13 +29,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/net/minecraft/server/level/ChunkHolder.java
 +++ b/src/main/java/net/minecraft/server/level/ChunkHolder.java
 @@ -0,0 +0,0 @@ public class ChunkHolder {
-                 ioPriority = com.destroystokyo.paper.io.PrioritizedTaskQueue.HIGH_PRIORITY;
-             }
-             chunkMap.level.asyncChunkTaskManager.raisePriority(pos.x, pos.z, ioPriority);
-+            chunkMap.level.getChunkSource().getLightEngine().queue.changePriority(pos.toLong(), this.queueLevel, priority); // Paper
          }
-         if (this.queueLevel != priority) {
-             this.onLevelChange.onLevelChange(this.pos, () -> this.queueLevel, priority, p -> this.queueLevel = p); // use preferred priority
+ 
+         this.onLevelChange.onLevelChange(this.pos, this::getQueueLevel, this.ticketLevel, this::setQueueLevel);
+-        this.oldTicketLevel = this.ticketLevel;
++        //chunkMap.level.getChunkSource().getLightEngine().queue.changePriority(pos.toLong(), this.queueLevel, priority); // Paper // Restore this in chunk priority later?
+         // CraftBukkit start
+         // ChunkLoadEvent: Called after the chunk is loaded: isChunkLoaded returns true and chunk is ready to be modified by plugins.
+         if (!playerchunk_state.isOrAfter(ChunkHolder.FullChunkStatus.BORDER) && playerchunk_state1.isOrAfter(ChunkHolder.FullChunkStatus.BORDER)) {
 diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/level/ChunkMap.java