SPIGOT-117: Fix sticky pistons firing for the wrong direction when pulling blocks backwards

nms-patches/BlockPiston.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde//net/minecraft/server/BlockPiston.java	2014-11-28 17:43:42.933707439 +0000
-+++ src/main/java/net/minecraft/server/BlockPiston.java	2014-11-28 17:38:20.000000000 +0000
+--- ../work/decompile-8eb82bde//net/minecraft/server/BlockPiston.java	2014-12-05 15:10:57.106252715 +0000
++++ src/main/java/net/minecraft/server/BlockPiston.java	2014-12-05 15:10:54.834252765 +0000
 @@ -1,6 +1,16 @@
  package net.minecraft.server;
  
@@ -38,7 +38,7 @@
              world.setTypeAndData(blockposition, iblockdata.set(BlockPiston.EXTENDED, Boolean.valueOf(false)), 2);
              world.playBlockAction(blockposition, this, 1, enumdirection.a());
          }
-@@ -286,6 +305,35 @@
+@@ -286,10 +305,40 @@
          if (!pistonextendschecker.a()) {
              return false;
          } else {
@@ -64,13 +64,18 @@
 +                }
 +            };
 +
-+            BlockPistonExtendEvent event = new BlockPistonExtendEvent(bblock, blocks, CraftBlock.notchToBlockFace(enumdirection));
+             int i = list.size() + list1.size();
+             Block[] ablock = new Block[i];
+             EnumDirection enumdirection1 = flag ? enumdirection : enumdirection.opposite();
+ 
++            BlockPistonExtendEvent event = new BlockPistonExtendEvent(bblock, blocks, CraftBlock.notchToBlockFace(enumdirection1));
 +            world.getServer().getPluginManager().callEvent(event);
 +
 +            if (event.isCancelled()) {
 +                return false;
 +            }
 +            // CraftBukkit end
-             int i = list.size() + list1.size();
-             Block[] ablock = new Block[i];
-             EnumDirection enumdirection1 = flag ? enumdirection : enumdirection.opposite();
++
+             int j;
+             BlockPosition blockposition1;
+