Fixed redstone current being sent even if a BlockPlace was cancelled.

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

@@ -49,8 +49,6 @@ public class ItemRedstone extends Item {
         if (Block.REDSTONE_WIRE.canPlace(world, i, j, k)) {
             BlockState blockState = CraftBlockState.getBlockState(world, i, j, k); // CraftBukkit
 
-            world.setTypeId(i, j, k, Block.REDSTONE_WIRE.id);
-
             // CraftBukkit start - redstone
             BlockPlaceEvent event = CraftEventFactory.callBlockPlaceEvent(world, entityhuman, blockState, clickedX, clickedY, clickedZ, Block.REDSTONE_WIRE);
 
@@ -58,6 +56,8 @@ public class ItemRedstone extends Item {
                 event.getBlockPlaced().setTypeIdAndData(blockState.getTypeId(), blockState.getRawData(), false);
                 return false;
             }
+
+            world.setTypeId(i, j, k, Block.REDSTONE_WIRE.id); // CraftBukkit - Must take place after BlockPlaceEvent
             // CraftBukkit end
 
             --itemstack.count; // CraftBukkit - ORDER MATTERS