don't search for portal creation when looking down

Spigot-Server-Patches/0645-don-t-search-for-portal-creation-when-looking-down.patch

@@ -0,0 +1,23 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: lukas81298 <lukas81298@gmail.com>
+Date: Tue, 5 Jan 2021 14:53:42 +0100
+Subject: [PATCH] don't search for portal creation when looking down
+
+
+diff --git a/src/main/java/net/minecraft/server/BlockFireAbstract.java b/src/main/java/net/minecraft/server/BlockFireAbstract.java
+index 172e4b3eeecc3808a335b80bb44bc6be3d8dd33d..5727b6f8d94040868ba752ea186b8e8995e189b6 100644
+--- a/src/main/java/net/minecraft/server/BlockFireAbstract.java
++++ b/src/main/java/net/minecraft/server/BlockFireAbstract.java
+@@ -109,7 +109,11 @@ public abstract class BlockFireAbstract extends Block {
+                     break;
+                 }
+             }
+-
++            // Paper start - don't search for portal creation when looking down
++            if(enumdirection == EnumDirection.DOWN || enumdirection == EnumDirection.UP) {
++                return false;
++            }
++            // Paper end
+             return flag && BlockPortalShape.a((GeneratorAccess) world, blockposition, enumdirection.h().n()).isPresent();
+         }
+     }