Paper/patches/server/1051-Properly-handle-experience-dropping-on-block-break.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sat, 30 Dec 2023 15:00:06 -0500
Subject: [PATCH] Properly handle experience dropping on block break

This causes spawnAfterBreak to spawn xp by default, removing the need to manually add xp wherever this method is used.
For classes that use custom xp amounts, they can drop the resources with disabling

diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 2c2189a31c608c99abe6a9c0a78bdcb717b51aba..00ff7de3fe0feb166a792c61aa81a1e201d7e928 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -1103,7 +1103,8 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
             if (drop) {
                 BlockEntity tileentity = iblockdata.hasBlockEntity() ? this.getBlockEntity(pos) : null;
 
-                Block.dropResources(iblockdata, this, pos, tileentity, breakingEntity, ItemStack.EMPTY);
+                Block.dropResources(iblockdata, this, pos, tileentity, breakingEntity, ItemStack.EMPTY, false); // Paper - Properly handle xp dropping
+                iblockdata.getBlock().popExperience((ServerLevel) this, pos, xp, breakingEntity); // Paper - Properly handle xp dropping; custom amount
             }
 
             boolean flag1 = this.setBlock(pos, fluid.createLegacyBlock(), 3, maxUpdateDepth);
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index 8ac67dd1b06eee08787150abdfc74a8cccec94fc..3f2fdf73e2e520838c7b59fe994e67ab2d1a4d6b 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -333,23 +333,31 @@ public class Block extends BlockBehaviour implements ItemLike {
             for (net.minecraft.world.item.ItemStack drop : net.minecraft.world.level.block.Block.getDrops(state, world.getMinecraftWorld(), pos, blockEntity)) {
                 items.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(drop));
             }
+            Block block = state.getBlock(); // Paper - Properly handle xp dropping
             io.papermc.paper.event.block.BlockBreakBlockEvent event = new io.papermc.paper.event.block.BlockBreakBlockEvent(org.bukkit.craftbukkit.block.CraftBlock.at(world, pos), org.bukkit.craftbukkit.block.CraftBlock.at(world, source), items);
+            event.setExpToDrop(block.getExpDrop(state, (ServerLevel) world, pos, net.minecraft.world.item.ItemStack.EMPTY, true)); // Paper - Properly handle xp dropping
             event.callEvent();
             for (var drop : event.getDrops()) {
                 popResource(world.getMinecraftWorld(), pos, org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(drop));
             }
-            state.spawnAfterBreak(world.getMinecraftWorld(), pos, ItemStack.EMPTY, true);
+            state.spawnAfterBreak(world.getMinecraftWorld(), pos, ItemStack.EMPTY, false); // Paper - Properly handle xp dropping
+            block.popExperience((ServerLevel) world, pos, event.getExpToDrop()); // Paper - Properly handle xp dropping
         }
         return true;
     }
     // Paper end
 
     public static void dropResources(BlockState state, Level world, BlockPos pos, @Nullable BlockEntity blockEntity, @Nullable Entity entity, ItemStack tool) {
+    // Paper start - Properly handle xp dropping
+        dropResources(state, world, pos, blockEntity, entity, tool, true);
+    }
+    public static void dropResources(BlockState state, Level world, BlockPos pos, @Nullable BlockEntity blockEntity, @Nullable Entity entity, ItemStack tool, boolean dropExperience) {
+    // Paper end - Properly handle xp dropping
         if (world instanceof ServerLevel) {
             Block.getDrops(state, (ServerLevel) world, pos, blockEntity, entity, tool).forEach((itemstack1) -> {
                 Block.popResource(world, pos, itemstack1);
             });
-            state.spawnAfterBreak((ServerLevel) world, pos, tool, true);
+            state.spawnAfterBreak((ServerLevel) world, pos, tool, dropExperience); // Paper - Properly handle xp dropping
         }
 
     }
@@ -433,7 +441,7 @@ public class Block extends BlockBehaviour implements ItemLike {
         player.awardStat(Stats.BLOCK_MINED.get(this));
         player.causeFoodExhaustion(0.005F, org.bukkit.event.entity.EntityExhaustionEvent.ExhaustionReason.BLOCK_MINED); // CraftBukkit - EntityExhaustionEvent
         if (includeDrops) { // Paper - fix drops not preventing stats/food exhaustion
-        Block.dropResources(state, world, pos, blockEntity, player, tool);
+        Block.dropResources(state, world, pos, blockEntity, player, tool, dropExp); // Paper - Properly handle xp dropping
         } // Paper - fix drops not preventing stats/food exhaustion
     }
 
diff --git a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
index 17d2b90441d7513d7907b988610be8604ac05282..f03fd4bc44fb95cc17cae69dbe3fd684ed562d6f 100644
--- a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
+++ b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
@@ -1286,6 +1286,7 @@ public abstract class BlockBehaviour implements FeatureElement {
 
         public void spawnAfterBreak(ServerLevel world, BlockPos pos, ItemStack tool, boolean dropExperience) {
             this.getBlock().spawnAfterBreak(this.asState(), world, pos, tool, dropExperience);
+            if (dropExperience) {getBlock().popExperience(world, pos, this.getBlock().getExpDrop(asState(), world, pos, tool, true));} // Paper - Properly handle xp dropping
         }
 
         public List<ItemStack> getDrops(LootParams.Builder builder) {
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
index e5506a7d074a9f89d41f4d5d7549a458779bef20..4b42ef2a876ea210d948238e63fd7a2b7035bb5b 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -503,7 +503,7 @@ public class CraftBlock implements Block {
 
         // Modelled off EntityHuman#hasBlock
         if (block != Blocks.AIR && (item == null || !iblockdata.requiresCorrectToolForDrops() || nmsItem.isCorrectToolForDrops(iblockdata))) {
-            net.minecraft.world.level.block.Block.dropResources(iblockdata, this.world.getMinecraftWorld(), this.position, this.world.getBlockEntity(this.position), null, nmsItem);
+            net.minecraft.world.level.block.Block.dropResources(iblockdata, this.world.getMinecraftWorld(), this.position, this.world.getBlockEntity(this.position), null, nmsItem, false); // Paper - Properly handle xp dropping
             // Paper start - improve Block#breanNaturally
             if (triggerEffect) {
                 if (iblockdata.getBlock() instanceof net.minecraft.world.level.block.BaseFireBlock) {