Don't allow liquids to flow into unloaded chunks

nms-patches/BlockFlowing.patch

@@ -1,5 +1,5 @@
---- /home/matt/mc-dev-private//net/minecraft/server/BlockFlowing.java	2015-02-26 22:40:22.127608144 +0000
-+++ src/main/java/net/minecraft/server/BlockFlowing.java	2015-02-26 22:40:22.127608144 +0000
+--- /home/matt/mc-dev-private//net/minecraft/server/BlockFlowing.java	2015-04-01 17:20:36.772751379 +0100
++++ src/main/java/net/minecraft/server/BlockFlowing.java	2015-04-01 17:20:36.772751379 +0100
 @@ -5,6 +5,11 @@
  import java.util.Random;
  import java.util.Set;
@@ -12,20 +12,18 @@
  public class BlockFlowing extends BlockFluids {
  
      int a;
-@@ -18,7 +23,12 @@
+@@ -18,6 +23,11 @@
      }
  
      public void b(World world, BlockPosition blockposition, IBlockData iblockdata, Random random) {
--        int i = ((Integer) iblockdata.get(BlockFlowing.LEVEL)).intValue();
 +        // CraftBukkit start
 +        org.bukkit.World bworld = world.getWorld();
 +        org.bukkit.Server server = world.getServer();
 +        org.bukkit.block.Block source = bworld == null ? null : bworld.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
 +        // CraftBukkit end
-+        int i = ((Integer) iblockdata.get(LEVEL)).intValue();
+         int i = ((Integer) iblockdata.get(BlockFlowing.LEVEL)).intValue();
          byte b0 = 1;
  
-         if (this.material == Material.LAVA && !world.worldProvider.n()) {
 @@ -88,6 +98,12 @@
          IBlockData iblockdata2 = world.getType(blockposition.down());
  
@@ -48,7 +46,7 @@
          } else if (i >= 0 && (i == 0 || this.g(world, blockposition.down(), iblockdata2))) {
              Set set = this.f(world, blockposition);
  
-@@ -116,7 +134,16 @@
+@@ -116,14 +134,23 @@
              while (iterator1.hasNext()) {
                  EnumDirection enumdirection1 = (EnumDirection) iterator1.next();
  
@@ -66,3 +64,11 @@
              }
          }
  
+     }
+ 
+     private void flow(World world, BlockPosition blockposition, IBlockData iblockdata, int i) {
+-        if (this.h(world, blockposition, iblockdata)) {
++        if (world.isLoaded(blockposition) && this.h(world, blockposition, iblockdata)) { // CraftBukkit - add isLoaded check
+             if (iblockdata.getBlock() != Blocks.AIR) {
+                 if (this.material == Material.LAVA) {
+                     this.fizz(world, blockposition);