Paper/patches/unapplied/server/0968-Fix-possible-NPE-on-painting-creation.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sat, 24 Jun 2023 09:42:53 -0700
Subject: [PATCH] Fix possible NPE on painting creation


diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
index 7ef90fbdbcdb12ae0f3837fb003112115ab7ecfe..4289cce80f9861b809062a29c0d89b9dbd0ba8cd 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
@@ -917,6 +917,7 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
                         AABB bb = (ItemFrame.class.isAssignableFrom(clazz))
                                 ? net.minecraft.world.entity.decoration.ItemFrame.calculateBoundingBox(null, pos, CraftBlock.blockFaceToNotch(dir).getOpposite(), width, height)
                                 : HangingEntity.calculateBoundingBox(null, pos, CraftBlock.blockFaceToNotch(dir).getOpposite(), width, height);
+                        if (!this.getHandle().noCollision(bb)) continue; // Paper - add collision check
                         List<net.minecraft.world.entity.Entity> list = (List<net.minecraft.world.entity.Entity>) this.getHandle().getEntities(null, bb);
                         for (Iterator<net.minecraft.world.entity.Entity> it = list.iterator(); !taken && it.hasNext(); ) {
                             net.minecraft.world.entity.Entity e = it.next();
@@ -943,7 +944,8 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
                 if (Painting.class.isAssignableFrom(clazz)) {
                     if (this.isNormalWorld() && randomizeData) {
                         entity = net.minecraft.world.entity.decoration.Painting.create(world, pos, dir).orElse(null);
-                    } else {
+                    } // Paper
+                    if (entity == null) { // Paper - if randomizeData fails, force it
                         entity = new net.minecraft.world.entity.decoration.Painting(net.minecraft.world.entity.EntityType.PAINTING, this.getHandle().getMinecraftWorld());
                         entity.absMoveTo(x, y, z, yaw, pitch);
                         ((net.minecraft.world.entity.decoration.Painting) entity).setDirection(dir);