From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: chickeneer <emcchickeneer@gmail.com>
Date: Fri, 5 Jun 2020 20:02:04 -0500
Subject: [PATCH] Fix villager trading demand - MC-163962

Prevent demand from going negative and tending to negative infinity

diff --git a/src/main/java/net/minecraft/world/item/trading/MerchantOffer.java b/src/main/java/net/minecraft/world/item/trading/MerchantOffer.java
index 44808589939afe50d8294269b7da12019acd2690..89982d25f60c8b60ba91e559ef88278f338fe215 100644
--- a/src/main/java/net/minecraft/world/item/trading/MerchantOffer.java
+++ b/src/main/java/net/minecraft/world/item/trading/MerchantOffer.java
@@ -124,7 +124,7 @@ public class MerchantOffer {
     }
 
     public void updateDemand() {
-        this.demand = this.demand + this.uses - (this.maxUses - this.uses);
+        this.demand = Math.max(0, this.demand + this.uses - (this.maxUses - this.uses)); // Paper - Fix MC-163962
     }
 
     public ItemStack assemble() {
