PaperMC/patches/unapplied/0919-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 3f87e60c0d43703a8450b5920dac59a970809397..471fd54edf6aa962d997878ee638974f7f594fa8 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -617,7 +617,8 @@ 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 c083dc8b2a69c3747b250d13f1a28ad22b5e6119..bf52c36f31992a01a7403d8c85151327c9e944c4 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -312,23 +312,31 @@ public class Block extends BlockBehaviour implements ItemLike {
             for (ItemStack drop : Block.getDrops(state, serverLevel, 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(levelAccessor, pos), org.bukkit.craftbukkit.block.CraftBlock.at(levelAccessor, source), items);
+            event.setExpToDrop(block.getExpDrop(state, serverLevel, pos, net.minecraft.world.item.ItemStack.EMPTY, true)); // Paper - Properly handle xp dropping
             event.callEvent();
             for (org.bukkit.inventory.ItemStack drop : event.getDrops()) {
                 popResource(serverLevel, pos, org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(drop));
             }
-            state.spawnAfterBreak(serverLevel, pos, ItemStack.EMPTY, true);
+            state.spawnAfterBreak(serverLevel, pos, ItemStack.EMPTY, false); // Paper - Properly handle xp dropping
+            block.popExperience(serverLevel, pos, event.getExpToDrop()); // Paper - Properly handle xp dropping
         }
         return true;
     }
     // Paper end - Add BlockBreakBlockEvent
 
     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
         }
 
     }
@@ -412,7 +420,7 @@ 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 a8bec3c405732e5863cf717b1fe948d00837bed2..240c250a93289776686d09d7eae17c07d7278da5 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
@@ -1119,6 +1119,7 @@ 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 461a66c323a74db5a70981fafc5fa20f54f0f40d..ac11f18690434922179b61ffcc3036dea025b0cb 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -509,7 +509,7 @@ 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) {