Several fixes and new api for experience merging/stacking (#9242)

patches/server/0914-Add-player-idle-duration-API.patch

@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: booky10 <boooky10@gmail.com>
+Date: Sat, 14 Oct 2023 03:11:11 +0200
+Subject: [PATCH] Add player idle duration API
+
+Implements API for getting and resetting a player's idle duration.
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+index 5da5dc72a0ddb45515bce0ea81825f5368bbd997..027abbde974ff2c4844c3d815230d600140690a4 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+@@ -3391,6 +3391,18 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+     }
+     // Paper end
+ 
++    // Paper start
++    @Override
++    public Duration getIdleDuration() {
++        return Duration.ofMillis(net.minecraft.Util.getMillis() - this.getHandle().getLastActionTime());
++    }
++
++    @Override
++    public void resetIdleDuration() {
++        this.getHandle().resetLastActionTime();
++    }
++    // Paper end
++
+     public Player.Spigot spigot()
+     {
+         return this.spigot;