using generator settings from WorldCreator to specify presets for FLAT or CUSTOMIZED world types

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -848,7 +848,9 @@ public final class CraftServer implements Server {
         IDataManager sdm = new ServerNBTManager(getWorldContainer(), name, true);
         WorldData worlddata = sdm.getWorldData();
         if (worlddata == null) {
-            worlddata = new WorldData(new WorldSettings(creator.seed(), EnumGamemode.getById(getDefaultGameMode().getValue()), generateStructures, hardcore, type), name);
+            WorldSettings worldSettings = new WorldSettings(creator.seed(), EnumGamemode.getById(getDefaultGameMode().getValue()), generateStructures, hardcore, type);
+            worldSettings.setGeneratorSettings(creator.generatorSettings());
+            worlddata = new WorldData(worldSettings, name);
         }
         worlddata.checkName(name); // CraftBukkit - Migration did not rewrite the level.dat; This forces 1.8 to take the last loaded world as respawn (in this case the end)
         WorldServer internal = (WorldServer) new WorldServer(console, sdm, worlddata, dimension, console.methodProfiler, creator.environment(), generator).b();