Made Mycel blocks throw BlockFade and BlockSpread events. This fixes BUKKIT-488. Thanks to tips48 for the pull request.

src/main/java/net/minecraft/server/BlockMycel.java

@@ -1,6 +1,8 @@
 package net.minecraft.server;
 
 import java.util.Random;
+import org.bukkit.event.block.BlockFadeEvent; // CraftBukkit
+import org.bukkit.event.block.BlockSpreadEvent; // CraftBukkit
 
 public class BlockMycel extends Block {
 
@@ -17,7 +19,18 @@ public class BlockMycel extends Block {
     public void a(World world, int i, int j, int k, Random random) {
         if (!world.isStatic) {
             if (world.getLightLevel(i, j + 1, k) < 4 && Block.q[world.getTypeId(i, j + 1, k)] > 2) {
-                world.setTypeId(i, j, k, Block.DIRT.id);
+                // CraftBukkit start
+                org.bukkit.World bworld = world.getWorld();
+                org.bukkit.block.BlockState blockState = bworld.getBlockAt(i, j, k).getState();
+                blockState.setTypeId(Block.DIRT.id);
+
+                BlockFadeEvent event = new BlockFadeEvent(blockState.getBlock(), blockState);
+                world.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled()) {
+                    blockState.update(true);
+                }
+                // CraftBukkit end
             } else if (world.getLightLevel(i, j + 1, k) >= 9) {
                 for (int l = 0; l < 4; ++l) {
                     int i1 = i + random.nextInt(3) - 1;
@@ -26,7 +39,18 @@ public class BlockMycel extends Block {
                     int l1 = world.getTypeId(i1, j1 + 1, k1);
 
                     if (world.getTypeId(i1, j1, k1) == Block.DIRT.id && world.getLightLevel(i1, j1 + 1, k1) >= 4 && Block.q[l1] <= 2) {
-                        world.setTypeId(i1, j1, k1, this.id);
+                        // CraftBukkit start
+                        org.bukkit.World bworld = world.getWorld();
+                        org.bukkit.block.BlockState blockState = bworld.getBlockAt(i1, j1, k1).getState();
+                        blockState.setTypeId(this.id);
+
+                        BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(i, j, k), blockState);
+                        world.getServer().getPluginManager().callEvent(event);
+
+                        if (!event.isCancelled()) {
+                            blockState.update(true);
+                        }
+                        // CraftBukkit end
                     }
                 }
             }