PaperMC/nms-patches/BlockGrass.patch

--- a/net/minecraft/server/BlockGrass.java
+++ b/net/minecraft/server/BlockGrass.java
@@ -2,6 +2,14 @@
 
 import java.util.Random;
 
+// CraftBukkit start
+import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.event.block.BlockSpreadEvent;
+import org.bukkit.event.block.BlockFadeEvent;
+// CraftBukkit end
+
 public class BlockGrass extends Block implements IBlockFragilePlantElement {
 
     public static final BlockStateBoolean SNOWY = BlockStateBoolean.of("snowy");
@@ -22,7 +30,19 @@
     public void b(World world, BlockPosition blockposition, IBlockData iblockdata, Random random) {
         if (!world.isClientSide) {
             if (world.getLightLevel(blockposition.up()) < 4 && world.getType(blockposition.up()).c() > 2) {
-                world.setTypeUpdate(blockposition, Blocks.DIRT.getBlockData());
+                // CraftBukkit start
+                // world.setTypeUpdate(blockposition, Blocks.DIRT.getBlockData());
+                org.bukkit.World bworld = world.getWorld();
+                BlockState blockState = bworld.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()).getState();
+                blockState.setType(CraftMagicNumbers.getMaterial(Blocks.DIRT));
+
+                BlockFadeEvent event = new BlockFadeEvent(blockState.getBlock(), blockState);
+                world.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled()) {
+                    blockState.update(true);
+                }
+                // CraftBukkit end
             } else {
                 if (world.getLightLevel(blockposition.up()) >= 9) {
                     for (int i = 0; i < 4; ++i) {
@@ -36,7 +56,19 @@
                         IBlockData iblockdata2 = world.getType(blockposition1);
 
                         if (iblockdata2.getBlock() == Blocks.DIRT && iblockdata2.get(BlockDirt.VARIANT) == BlockDirt.EnumDirtVariant.DIRT && world.getLightLevel(blockposition1.up()) >= 4 && iblockdata1.c() <= 2) {
-                            world.setTypeUpdate(blockposition1, Blocks.GRASS.getBlockData());
+                            // CraftBukkit start
+                            // world.setTypeUpdate(blockposition1, Blocks.GRASS.getBlockData());
+                            org.bukkit.World bworld = world.getWorld();
+                            BlockState blockState = bworld.getBlockAt(blockposition1.getX(), blockposition1.getY(), blockposition1.getZ()).getState();
+                            blockState.setType(CraftMagicNumbers.getMaterial(Blocks.GRASS));
+
+                            BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()), blockState);
+                            world.getServer().getPluginManager().callEvent(event);
+
+                            if (!event.isCancelled()) {
+                                blockState.update(true);
+                            }
+                            // CraftBukkit end
                         }
                     }
                 }
@@ -79,13 +111,15 @@
                         IBlockData iblockdata1 = blockflowers.getBlockData().set(blockflowers.g(), blockflowers_enumflowervarient);
 
                         if (blockflowers.f(world, blockposition2, iblockdata1)) {
-                            world.setTypeAndData(blockposition2, iblockdata1, 3);
+                            // world.setTypeAndData(blockposition2, iblockdata1, 3); // CraftBukkit
+                            CraftEventFactory.handleBlockGrowEvent(world, blockposition2.getX(), blockposition2.getY(), blockposition2.getZ(), iblockdata1.getBlock(), iblockdata1.getBlock().toLegacyData(iblockdata1)); // CraftBukkit
                         }
                     } else {
                         IBlockData iblockdata2 = Blocks.TALLGRASS.getBlockData().set(BlockLongGrass.TYPE, BlockLongGrass.EnumTallGrassType.GRASS);
 
                         if (Blocks.TALLGRASS.f(world, blockposition2, iblockdata2)) {
-                            world.setTypeAndData(blockposition2, iblockdata2, 3);
+                            // world.setTypeAndData(blockposition2, iblockdata2, 3); // CraftBukkit
+                            CraftEventFactory.handleBlockGrowEvent(world, blockposition2.getX(), blockposition2.getY(), blockposition2.getZ(), iblockdata2.getBlock(), iblockdata2.getBlock().toLegacyData(iblockdata2)); // CraftBukkit
                         }
                     }
                 }