SPIGOT-665: Fix ghost blocks when cancelling piston events

nms-patches/BlockPiston.patch

@@ -1,5 +1,5 @@
---- /home/matt/mc-dev-private//net/minecraft/server/BlockPiston.java	2015-02-26 22:40:22.195608144 +0000
-+++ src/main/java/net/minecraft/server/BlockPiston.java	2015-02-26 22:40:22.199608144 +0000
+--- /home/matt/mc-dev-private//net/minecraft/server/BlockPiston.java	2015-03-09 22:33:56.816544171 +0000
++++ src/main/java/net/minecraft/server/BlockPiston.java	2015-03-09 22:33:56.816544171 +0000
 @@ -2,6 +2,18 @@
  
  import java.util.List;
@@ -46,15 +46,15 @@
                      this.a(world, blockposition, enumdirection, false);
                  }
              } else {
-@@ -286,10 +309,46 @@
+@@ -286,10 +309,53 @@
          if (!pistonextendschecker.a()) {
              return false;
          } else {
 +            // CraftBukkit start
 +            final org.bukkit.block.Block bblock = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
 +
-+            final List moved = pistonextendschecker.getMovedBlocks();
-+            final List broken = pistonextendschecker.getBrokenBlocks();
++            final List<BlockPosition> moved = pistonextendschecker.getMovedBlocks();
++            final List<BlockPosition> broken = pistonextendschecker.getBrokenBlocks();
 +
 +            List<org.bukkit.block.Block> blocks = new AbstractList<org.bukkit.block.Block>() {
 +
@@ -86,6 +86,13 @@
 +            world.getServer().getPluginManager().callEvent(event);
 +
 +            if (event.isCancelled()) {
++                for (BlockPosition b : broken) {
++                    world.notify(b);
++                }
++                for (BlockPosition b : moved) {
++                    world.notify(b);
++                    world.notify(b.shift(enumdirection1));
++                }
 +                return false;
 +            }
 +            // CraftBukkit end