Work around crash while loading flatworld with modded structures. (Mi…

…necraftForge#7764)

* Work around crash while loading flatworld with modded structures.

* Maybe fix issue with gradle daemon leaking memory and slowing down CI builds.

.gitignore

@@ -39,8 +39,6 @@ changelog.txt
 *.7z
 /logs/
 
-gradle.properties
-!/mdk/gradle.properties
 /projects/forge/rejects/
 
 # Srg2Source causes import bugs on these patches. If you intentionnally change these, remove the ignore.

gradle.properties

@@ -0,0 +1,4 @@
+# Sets default memory used for gradle commands. Can be overridden by user or command line properties.
+# This is required to provide enough memory for the Minecraft decompilation process.
+org.gradle.jvmargs=-Xmx3G
+org.gradle.daemon=false

patches/minecraft/net/minecraft/world/gen/FlatGenerationSettings.java.patch

@@ -1,5 +1,23 @@
 --- a/net/minecraft/world/gen/FlatGenerationSettings.java
 +++ b/net/minecraft/world/gen/FlatGenerationSettings.java
+@@ -147,8 +_,16 @@
+          biomegenerationsettings$builder.func_242513_a(GenerationStage.Decoration.LAKES, Features.field_243790_P);
+       }
+
++      Map<Structure<?>, StructureFeature<?, ?>> map = new java.util.HashMap<>(field_202247_j);
++      net.minecraft.util.registry.WorldGenRegistries.field_243654_f.func_201756_e().filter(f -> !map.containsKey(f.field_236268_b_)).forEach(f -> map.put(f.field_236268_b_, f));
+       for(Entry<Structure<?>, StructureSeparationSettings> entry : this.field_236933_f_.func_236195_a_().entrySet()) {
+-         biomegenerationsettings$builder.func_242516_a(biomegenerationsettings.func_242491_a(field_202247_j.get(entry.getKey())));
++         if (!map.containsKey(entry.getKey())) {
++            field_211404_q.error("FORGE: There's no known StructureFeature for {} when preparing the {} flatworld biome." +
++                    " The structure will be skipped and may not spawn." +
++                    " Please register your StructureFeatures in the WorldGenRegistries!", entry.getKey().func_143025_a(), biome.getRegistryName());
++            continue;
++         }
++         biomegenerationsettings$builder.func_242516_a(biomegenerationsettings.func_242491_a(map.get(entry.getKey())));
+       }
+
+       boolean flag = (!this.field_202245_D || this.field_242867_d.func_230519_c_(biome).equals(Optional.of(Biomes.field_185440_P))) && this.field_236934_k_;
 @@ -174,7 +_,7 @@
           }
        }