Fix task splitting causing generation of already generated sections

core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataSourceProvider.java

@@ -34,7 +34,6 @@ import com.seibel.distanthorizons.core.pooling.PhantomArrayListCheckout;
 import com.seibel.distanthorizons.core.pooling.PhantomArrayListPool;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
-import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker;
@@ -455,6 +454,23 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 			};
 		}
 		
+		@Override
+		public CompletableFuture<Boolean> shouldGenerateSplitChild(long pos)
+		{
+			return GeneratedFullDataSourceProvider.this.getAsync(pos).thenApply(fullDataSource ->
+			{
+				//noinspection TryFinallyCanBeTryWithResources
+				try
+				{
+					return !GeneratedFullDataSourceProvider.this.isFullyGenerated(fullDataSource.columnGenerationSteps);
+				}
+				finally
+				{
+					fullDataSource.close();
+				}
+			});
+		}
+		
 	}
 	private CompletableFuture<Void> onDataSourceSaveAsync(FullDataSourceV2 fullDataSource) 
 	{

core/src/main/java/com/seibel/distanthorizons/core/generation/RemoteWorldRetrievalQueue.java

@@ -74,7 +74,14 @@ public class RemoteWorldRetrievalQueue extends AbstractFullDataNetworkRequestQue
 							return WorldGenResult.CreateFail();
 						case REQUIRES_SPLITTING:
 							List<CompletableFuture<WorldGenResult>> childFutures = new ArrayList<>(4);
-							DhSectionPos.forEachChild(sectionPos, childPos -> childFutures.add(this.submitRetrievalTask(childPos, requiredDataDetail, tracker)));
+							DhSectionPos.forEachChild(sectionPos, childPos -> {
+								tracker.shouldGenerateSplitChild(childPos).thenAccept(shouldGenerate -> {
+									if (shouldGenerate)
+									{
+										childFutures.add(this.submitRetrievalTask(childPos, requiredDataDetail, tracker));
+									}
+								});
+							});
 							return WorldGenResult.CreateSplit(childFutures);
 					}
 					

core/src/main/java/com/seibel/distanthorizons/core/generation/tasks/IWorldGenTaskTracker.java

@@ -22,6 +22,7 @@ package com.seibel.distanthorizons.core.generation.tasks;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 
 import javax.annotation.Nullable;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Consumer;
 
 /**
@@ -33,4 +34,6 @@ public interface IWorldGenTaskTracker
 	@Nullable
 	Consumer<FullDataSourceV2> getDataSourceConsumer();
 	
+	CompletableFuture<Boolean> shouldGenerateSplitChild(long pos);
+	
 }