make dupe uuid saferegen delete range configurable

also ensure we never process already valid entities. this shouldnt be possible as of recent
commits as we made the entity slice array safer, but doesn't hurt for this logic to be safe too
incase that patch got dropped in a future version by accident/necessarily

Spigot-Server-Patches/0338-Duplicate-UUID-Resolve-Option.patch

@@ -1,4 +1,4 @@
-From af75c184b955299758aaf93c63af5910425309ae Mon Sep 17 00:00:00 2001
+From b40bcfb513f86c14a0fa7cd15281fa6fff4f7aed Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Sat, 21 Jul 2018 14:27:34 -0400
 Subject: [PATCH] Duplicate UUID Resolve Option
@@ -33,10 +33,10 @@ But for those who are ok with leaving this inconsistent behavior, you may use WA
 It is recommended you regenerate the entities, as these were legit entities, and deserve your love.
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index 14c8edeffc..b373bba864 100644
+index 14c8edeffc..c3bd82692d 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-@@ -541,4 +541,45 @@ public class PaperWorldConfig {
+@@ -541,4 +541,47 @@ public class PaperWorldConfig {
              log("Bed Search Radius: " + bedSearchRadius);
          }
      }
@@ -45,13 +45,15 @@ index 14c8edeffc..b373bba864 100644
 +        SAFE_REGEN, REGEN, DELETE, NOTHING, WARN
 +    }
 +    public DuplicateUUIDMode duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN;
++    public int duplicateUUIDDeleteRange = 32;
 +    private void repairDuplicateUUID() {
 +        String desiredMode = getString("duplicate-uuid-resolver", "saferegen").toLowerCase().trim();
++        duplicateUUIDDeleteRange = getInt("duplicate-uuid-saferegen-delete-range", duplicateUUIDDeleteRange);
 +        switch (desiredMode.toLowerCase()) {
 +            case "saferegen":
 +            case "saferegenerate":
 +                duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN;
-+                log("Duplicate UUID Resolve: Safer Regenerate New UUID (Delete likely duplicates)");
++                log("Duplicate UUID Resolve: Safer Regenerate New UUID (Delete likely duplicates within " + duplicateUUIDDeleteRange + " blocks)");
 +                break;
 +            case "regen":
 +            case "regenerate":
@@ -83,7 +85,7 @@ index 14c8edeffc..b373bba864 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index 4757081090..8cd2ed85bc 100644
+index 4757081090..3d5b6eabaf 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -1,5 +1,10 @@
@@ -123,7 +125,7 @@ index 4757081090..8cd2ed85bc 100644
 +                Map<UUID, Entity> thisChunk = new HashMap<>();
 +                for (Iterator<Entity> iterator = ((List<Entity>) entityslice).iterator(); iterator.hasNext(); ) {
 +                    Entity entity = iterator.next();
-+                    if (entity.dead) continue;
++                    if (entity.dead || entity.valid) continue;
 +                    Entity other = ((WorldServer) world).entitiesByUUID.get(entity.uniqueID);
 +                    if (other == null || other.dead || world.getEntityUnloadQueue().contains(other)) {
 +                        other = thisChunk.get(entity.uniqueID);
@@ -132,7 +134,7 @@ index 4757081090..8cd2ed85bc 100644
 +                    if (mode == DuplicateUUIDMode.SAFE_REGEN && other != null && !other.dead &&
 +                        !world.getEntityUnloadQueue().contains(other)
 +                        && java.util.Objects.equals(other.getSaveID(), entity.getSaveID())
-+                        && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < 24
++                        && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < world.paperConfig.duplicateUUIDDeleteRange
 +                    ) {
 +                        logger.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", deleted entity " + entity + " because it was near the duplicate and likely an actual duplicate. See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about.");
 +                        entity.die();
@@ -177,7 +179,7 @@ index 7b856cad91..eb8904a728 100644
          this.uniqueID = uuid;
          this.ar = this.uniqueID.toString();
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index a01488e985..3012768cb9 100644
+index 5de8da65c0..c53e77b821 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -70,7 +70,7 @@ public abstract class World implements IBlockAccess {

Spigot-Server-Patches/0340-Add-some-Debug-to-Chunk-Entity-slices.patch

@@ -1,4 +1,4 @@
-From 099d9012a80cc417b8b3be962d67942ce3162b0c Mon Sep 17 00:00:00 2001
+From e4d1385d484c0a847d796803128a541b22246000 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Mon, 23 Jul 2018 22:44:23 -0400
 Subject: [PATCH] Add some Debug to Chunk Entity slices
@@ -9,7 +9,7 @@ This should hopefully avoid duplicate entities ever being created
 if the entity was to end up in 2 different chunk slices
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index ccb30d5bfd..94b294e87b 100644
+index 195cde784b..575ddcb2a0 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -681,8 +681,33 @@ public class Chunk {

Spigot-Server-Patches/0348-Entity-add-to-world-fixes.patch

@@ -1,4 +1,4 @@
-From 65255110b50ca2fb51d2b95fa1cc8c5f61da88e8 Mon Sep 17 00:00:00 2001
+From 2a5ab03010c297502ce4c62084fbd321cd567634 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Fri, 3 Aug 2018 22:47:46 -0400
 Subject: [PATCH] Entity add to world fixes
@@ -14,7 +14,7 @@ Fix this by differing entity add to world for all entities at the same time
 the original entity is dead, overwrite it as the logic does for unloaod queued entities.
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index f41f282848..c6f47d4089 100644
+index 575ddcb2a0..3d512d7595 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -888,6 +888,7 @@ public class Chunk {