Paper/patches/server-remapped/0397-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 b49d4772932a58852b3195f5f56ff93dbcabf766..016fcc4ae20e1e48728a848be28633e624ae49a7 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -211,7 +211,7 @@ public abstract class LivingEntity extends Entity {
     private int noJumpDelay;
     private float absorptionAmount;
     public ItemStack useItem; // Paper - public
-    protected int useItemRemaining;
+    protected int useItemRemaining; protected final int getEatTimeTicks() { return this.useItemRemaining; } protected final void setEatTimeTicks(int value) { this.useItemRemaining = value; } // Paper - OBFHELPER
     protected int fallFlyTicks;
     private BlockPos lastPos;
     private Optional<BlockPos> lastClimbablePos;
@@ -3148,6 +3148,11 @@ 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)) {
@@ -3157,7 +3162,12 @@ public abstract class LivingEntity extends Entity {
                     this.triggerItemUseEffects(this.useItem, 5);
                 }
 
-                if (--this.useItemRemaining == 0 && !this.level.isClientSide && !this.useItem.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.setEatTimeTicks(0);
+                    // Paper end
                     this.completeUsingItem();
                 }
             } else {
@@ -3207,7 +3217,10 @@ 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, enumhand == InteractionHand.OFF_HAND);
@@ -3231,7 +3244,10 @@ 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
             }
         }
 
@@ -3359,7 +3375,10 @@ 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() {