SPIGOT-4192: Fix cancelling dispensers removing water sources

By: md_5 <git@md-5.net>

paper-server/nms-patches/DispenserRegistry.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/server/DispenserRegistry.java
 +++ b/net/minecraft/server/DispenserRegistry.java
-@@ -8,6 +8,15 @@
+@@ -8,6 +8,16 @@
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
@@ -9,6 +9,7 @@
 +import org.bukkit.Location;
 +import org.bukkit.TreeType;
 +import org.bukkit.craftbukkit.inventory.CraftItemStack;
++import org.bukkit.craftbukkit.util.DummyGeneratorAccess;
 +import org.bukkit.event.block.BlockDispenseEvent;
 +import org.bukkit.event.world.StructureGrowEvent;
 +// CraftBukkit end
@@ -16,7 +17,7 @@
  public class DispenserRegistry {
  
      public static final PrintStream a = System.out;
-@@ -70,7 +79,7 @@
+@@ -70,7 +80,7 @@
          BlockDispenser.a((IMaterial) Items.SPLASH_POTION, new IDispenseBehavior() {
              public ItemStack dispense(ISourceBlock isourceblock, final ItemStack itemstack) {
                  return (new DispenseBehaviorProjectile() {
@@ -25,7 +26,7 @@
                          return new EntityPotion(world, iposition.getX(), iposition.getY(), iposition.getZ(), itemstack1.cloneItemStack());
                      }
  
-@@ -87,7 +96,7 @@
+@@ -87,7 +97,7 @@
          BlockDispenser.a((IMaterial) Items.LINGERING_POTION, new IDispenseBehavior() {
              public ItemStack dispense(ISourceBlock isourceblock, final ItemStack itemstack) {
                  return (new DispenseBehaviorProjectile() {
@@ -34,7 +35,7 @@
                          return new EntityPotion(world, iposition.getX(), iposition.getY(), iposition.getZ(), itemstack1.cloneItemStack());
                      }
  
-@@ -106,11 +115,39 @@
+@@ -106,11 +116,39 @@
                  EnumDirection enumdirection = (EnumDirection) isourceblock.e().get(BlockDispenser.FACING);
                  EntityTypes entitytypes = ((ItemMonsterEgg) itemstack.getItem()).b(itemstack.getTag());
  
@@ -75,7 +76,7 @@
                  return itemstack;
              }
          };
-@@ -128,10 +165,39 @@
+@@ -128,10 +166,39 @@
                  double d0 = isourceblock.getX() + (double) enumdirection.getAdjacentX();
                  double d1 = (double) ((float) isourceblock.getBlockPosition().getY() + 0.2F);
                  double d2 = isourceblock.getZ() + (double) enumdirection.getAdjacentZ();
@@ -117,7 +118,7 @@
                  return itemstack;
              }
  
-@@ -152,8 +218,38 @@
+@@ -152,8 +219,38 @@
                  double d4 = random.nextGaussian() * 0.05D + (double) enumdirection.getAdjacentY();
                  double d5 = random.nextGaussian() * 0.05D + (double) enumdirection.getAdjacentZ();
  
@@ -158,7 +159,7 @@
                  return itemstack;
              }
  
-@@ -175,9 +271,52 @@
+@@ -175,9 +272,52 @@
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift((EnumDirection) isourceblock.e().get(BlockDispenser.FACING));
                  World world = isourceblock.getWorld();
  
@@ -212,7 +213,15 @@
                  } else {
                      return this.a.dispense(isourceblock, itemstack);
                  }
-@@ -207,6 +346,30 @@
+@@ -200,13 +340,39 @@
+                 Block block = iblockdata.getBlock();
+ 
+                 if (block instanceof IFluidSource) {
+-                    FluidType fluidtype = ((IFluidSource) block).a(world, blockposition, iblockdata);
++                    FluidType fluidtype = ((IFluidSource) block).a(DummyGeneratorAccess.INSTANCE, blockposition, iblockdata); // CraftBukkit
+ 
+                     if (!(fluidtype instanceof FluidTypeFlowing)) {
+                         return super.a(isourceblock, itemstack);
                      } else {
                          Item item = fluidtype.b();
  
@@ -238,12 +247,14 @@
 +                                return itemstack;
 +                            }
 +                        }
++
++                        fluidtype = ((IFluidSource) block).a(world, blockposition, iblockdata); // From above
 +                        // CraftBukkit end
 +
                          itemstack.subtract(1);
                          if (itemstack.isEmpty()) {
                              return new ItemStack(item);
-@@ -227,11 +390,39 @@
+@@ -227,11 +393,39 @@
              protected ItemStack a(ISourceBlock isourceblock, ItemStack itemstack) {
                  World world = isourceblock.getWorld();
  
@@ -284,7 +295,7 @@
                  } else {
                      Block block = world.getType(blockposition).getBlock();
  
-@@ -255,12 +446,55 @@
+@@ -255,12 +449,55 @@
                  this.a = true;
                  World world = isourceblock.getWorld();
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift((EnumDirection) isourceblock.e().get(BlockDispenser.FACING));
@@ -340,7 +351,7 @@
  
                  return itemstack;
              }
-@@ -269,11 +503,40 @@
+@@ -269,11 +506,40 @@
              protected ItemStack a(ISourceBlock isourceblock, ItemStack itemstack) {
                  World world = isourceblock.getWorld();
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift((EnumDirection) isourceblock.e().get(BlockDispenser.FACING));
@@ -383,7 +394,7 @@
                  return itemstack;
              }
          }));
-@@ -295,6 +558,30 @@
+@@ -295,6 +561,30 @@
                  EnumDirection enumdirection = (EnumDirection) isourceblock.e().get(BlockDispenser.FACING);
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift(enumdirection);
  
@@ -414,7 +425,7 @@
                  this.a = true;
                  if (world.isEmpty(blockposition) && BlockWitherSkull.b(world, blockposition, itemstack)) {
                      world.setTypeAndData(blockposition, (IBlockData) Blocks.WITHER_SKELETON_SKULL.getBlockData().set(BlockSkull.a, Integer.valueOf(enumdirection.opposite().get2DRotationValue() * 4)), 3);
-@@ -318,6 +605,30 @@
+@@ -318,6 +608,30 @@
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift((EnumDirection) isourceblock.e().get(BlockDispenser.FACING));
                  BlockPumpkinCarved blockpumpkincarved = (BlockPumpkinCarved) Blocks.CARVED_PUMPKIN;
  
@@ -445,7 +456,7 @@
                  this.a = true;
                  if (world.isEmpty(blockposition) && blockpumpkincarved.a((IWorldReader) world, blockposition)) {
                      if (!world.isClientSide) {
-@@ -379,6 +690,51 @@
+@@ -379,6 +693,51 @@
                  }
  
                  d();
@@ -497,7 +508,7 @@
              }
          }
      }
-@@ -387,7 +743,7 @@
+@@ -387,7 +746,7 @@
          LocaleLanguage localelanguage = LocaleLanguage.a();
  
          registrymaterials.iterator().forEachRemaining((object) -> {
@@ -506,7 +517,7 @@
  
              if (!localelanguage.b(s)) {
                  DispenserRegistry.c.warn("Missing translation for {}: {} (key: \'{}\')", s1, registrymaterials.b(object), s);
-@@ -481,6 +837,30 @@
+@@ -481,6 +840,30 @@
                  BlockPosition blockposition = isourceblock.getBlockPosition().shift(enumdirection);
                  EnumDirection enumdirection1 = isourceblock.getWorld().isEmpty(blockposition.down()) ? enumdirection : EnumDirection.UP;
  
@@ -537,7 +548,7 @@
                  this.a = ((ItemBlock) item).a((BlockActionContext) (new DispenserRegistry.b(isourceblock.getWorld(), blockposition, enumdirection, itemstack, enumdirection1))) == EnumInteractionResult.SUCCESS;
                  if (this.a) {
                      itemstack.subtract(1);
-@@ -534,12 +914,40 @@
+@@ -534,12 +917,40 @@
                  d3 = 0.0D;
              }