Paper/patches/server/0345-Lag-compensate-eating.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 14 Jan 2020 15:28:28 -0800
Subject: [PATCH] Lag compensate eating

When the server is lagging, players will wait longer when eating.
Change to also use a time check instead if it passes.

diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 590b8af46f8e060aa568dde50025b4f4c6bb162e..383a892a5c34ec5e8f7d102f5a9bec11ae193c0e 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3542,6 +3542,11 @@ public abstract class LivingEntity extends Entity {
         return ((Byte) this.entityData.get(LivingEntity.DATA_LIVING_ENTITY_FLAGS) & 2) > 0 ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
     }
 
+    // Paper start - lag compensate eating
+    protected long eatStartTime;
+    protected int totalEatTimeTicks;
+    // Paper end
+
     private void updatingUsingItem() {
         if (this.isUsingItem()) {
             if (ItemStack.isSameIgnoreDurability(this.getItemInHand(this.getUsedItemHand()), this.useItem)) {
@@ -3559,8 +3564,12 @@ public abstract class LivingEntity extends Entity {
         if (this.shouldTriggerItemUseEffects()) {
             this.triggerItemUseEffects(stack, 5);
         }
-
-        if (--this.useItemRemaining == 0 && !this.level.isClientSide && !stack.useOnRelease()) {
+        // Paper start - lag compensate eating
+        // we add 1 to the expected time to avoid lag compensating when we should not
+        boolean shouldLagCompensate = this.useItem.getItem().isEdible() && this.eatStartTime != -1 && (System.nanoTime() - this.eatStartTime) > ((1 + this.totalEatTimeTicks) * 50 * (1000 * 1000));
+        if ((--this.useItemRemaining == 0 || shouldLagCompensate) && !this.level.isClientSide && !this.useItem.useOnRelease()) {
+            this.useItemRemaining = 0;
+            // Paper end
             this.completeUsingItem();
         }
 
@@ -3608,7 +3617,10 @@ public abstract class LivingEntity extends Entity {
 
         if (!itemstack.isEmpty() && !this.isUsingItem() || forceUpdate) { // Paper use override flag
             this.useItem = itemstack;
-            this.useItemRemaining = itemstack.getUseDuration();
+            // Paper start - lag compensate eating
+            this.useItemRemaining = this.totalEatTimeTicks = itemstack.getUseDuration();
+            this.eatStartTime = System.nanoTime();
+            // Paper end
             if (!this.level.isClientSide) {
                 this.setLivingEntityFlag(1, true);
                 this.setLivingEntityFlag(2, hand == InteractionHand.OFF_HAND);
@@ -3633,7 +3645,10 @@ public abstract class LivingEntity extends Entity {
                 }
             } else if (!this.isUsingItem() && !this.useItem.isEmpty()) {
                 this.useItem = ItemStack.EMPTY;
-                this.useItemRemaining = 0;
+                // Paper start - lag compensate eating
+                this.useItemRemaining = this.totalEatTimeTicks = 0;
+                this.eatStartTime = -1L;
+                // Paper end
             }
         }
 
@@ -3766,7 +3781,10 @@ public abstract class LivingEntity extends Entity {
         }
 
         this.useItem = ItemStack.EMPTY;
-        this.useItemRemaining = 0;
+        // Paper start - lag compensate eating
+        this.useItemRemaining = this.totalEatTimeTicks = 0;
+        this.eatStartTime = -1L;
+        // Paper end
     }
 
     public boolean isBlocking() {