PaperMC/nms-patches/BlockVine.patch

--- a/net/minecraft/server/BlockVine.java
+++ b/net/minecraft/server/BlockVine.java
@@ -5,6 +5,8 @@
 import java.util.Random;
 import javax.annotation.Nullable;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class BlockVine extends Block {
 
     public static final BlockStateBoolean UP = BlockSprawling.e;
@@ -166,20 +168,24 @@
                         BlockPosition blockposition3 = blockposition2.shift(enumdirection1);
                         BlockPosition blockposition4 = blockposition2.shift(enumdirection2);
 
+                        // CraftBukkit start - Call BlockSpreadEvent
+                        BlockPosition source = blockposition;
+
                         if (flag && a((IBlockAccess) worldserver, blockposition3, enumdirection1)) {
-                            worldserver.setTypeAndData(blockposition2, (IBlockData) this.getBlockData().set(getDirection(enumdirection1), true), 2);
+                            CraftEventFactory.handleBlockSpreadEvent(worldserver, source, blockposition2, (IBlockData) this.getBlockData().set(getDirection(enumdirection1), true), 2);
                         } else if (flag1 && a((IBlockAccess) worldserver, blockposition4, enumdirection2)) {
-                            worldserver.setTypeAndData(blockposition2, (IBlockData) this.getBlockData().set(getDirection(enumdirection2), true), 2);
+                            CraftEventFactory.handleBlockSpreadEvent(worldserver, source, blockposition2, (IBlockData) this.getBlockData().set(getDirection(enumdirection2), true), 2);
                         } else {
                             EnumDirection enumdirection3 = enumdirection.opposite();
 
                             if (flag && worldserver.isEmpty(blockposition3) && a((IBlockAccess) worldserver, blockposition.shift(enumdirection1), enumdirection3)) {
-                                worldserver.setTypeAndData(blockposition3, (IBlockData) this.getBlockData().set(getDirection(enumdirection3), true), 2);
+                                CraftEventFactory.handleBlockSpreadEvent(worldserver, source, blockposition3, (IBlockData) this.getBlockData().set(getDirection(enumdirection3), true), 2);
                             } else if (flag1 && worldserver.isEmpty(blockposition4) && a((IBlockAccess) worldserver, blockposition.shift(enumdirection2), enumdirection3)) {
-                                worldserver.setTypeAndData(blockposition4, (IBlockData) this.getBlockData().set(getDirection(enumdirection3), true), 2);
+                                CraftEventFactory.handleBlockSpreadEvent(worldserver, source, blockposition4, (IBlockData) this.getBlockData().set(getDirection(enumdirection3), true), 2);
                             } else if ((double) worldserver.random.nextFloat() < 0.05D && a((IBlockAccess) worldserver, blockposition2.up(), EnumDirection.UP)) {
-                                worldserver.setTypeAndData(blockposition2, (IBlockData) this.getBlockData().set(BlockVine.UP, true), 2);
+                                CraftEventFactory.handleBlockSpreadEvent(worldserver, source, blockposition2, (IBlockData) this.getBlockData().set(BlockVine.UP, true), 2);
                             }
+                            // CraftBukkit end
                         }
                     } else if (a((IBlockAccess) worldserver, blockposition2, enumdirection)) {
                         worldserver.setTypeAndData(blockposition, (IBlockData) iblockdata.set(getDirection(enumdirection), true), 2);
@@ -209,7 +215,7 @@
                         }
 
                         if (this.canSpread(iblockdata2)) {
-                            worldserver.setTypeAndData(blockposition1, iblockdata2, 2);
+                            CraftEventFactory.handleBlockSpreadEvent(worldserver, blockposition, blockposition1, iblockdata2, 2); // CraftBukkit
                         }
 
                         return;
@@ -224,7 +230,7 @@
                         IBlockData iblockdata4 = this.a(iblockdata, iblockdata3, random);
 
                         if (iblockdata3 != iblockdata4 && this.canSpread(iblockdata4)) {
-                            worldserver.setTypeAndData(blockposition2, iblockdata4, 2);
+                            CraftEventFactory.handleBlockSpreadEvent(worldserver, blockposition, blockposition2, iblockdata4, 2); // CraftBukkit
                         }
                     }
                 }