Fix player death kept items not being in same slot (#6663)

patches/server/0322-PlayerDeathEvent-getItemsToKeep.patch

@@ -8,7 +8,7 @@ Exposes a mutable array on items a player should keep on death
 Example Usage: https://gist.github.com/aikar/5bb202de6057a051a950ce1f29feb0b4
 
 diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
-index 6d723445f80fc6db5880f658098046de5f13f563..dac01b65319ee246ddbb974ad379e2bd59033830 100644
+index 6d723445f80fc6db5880f658098046de5f13f563..dc0b6b9a22b31940cc997431af644ea9c772f8cb 100644
 --- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
 +++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
 @@ -724,6 +724,46 @@ public class ServerPlayer extends Player {
@@ -58,10 +58,11 @@ index 6d723445f80fc6db5880f658098046de5f13f563..dac01b65319ee246ddbb974ad379e2bd
      @Override
      public void die(DamageSource source) {
          boolean flag = this.level.getGameRules().getBoolean(GameRules.RULE_SHOWDEATHMESSAGES);
-@@ -810,6 +850,12 @@ public class ServerPlayer extends Player {
+@@ -809,7 +849,12 @@ public class ServerPlayer extends Player {
+         this.dropExperience();
          // we clean the player's inventory after the EntityDeathEvent is called so plugins can get the exact state of the inventory.
          if (!event.getKeepInventory()) {
-             this.getInventory().clearContent();
+-            this.getInventory().clearContent();
 +            // Paper start - replace logic
 +            for (NonNullList<ItemStack> inv : this.getInventory().compartments) {
 +                processKeep(event, inv);