Merge 1.19.4 into 1.20

common/src/main/java/org/embeddedt/modernfix/common/mixin/bugfix/world_leaks/MinecraftMixin.java

@@ -0,0 +1,41 @@
+package org.embeddedt.modernfix.common.mixin.bugfix.world_leaks;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.multiplayer.ClientLevel;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.lighting.LevelLightEngine;
+import org.embeddedt.modernfix.ModernFix;
+import org.jetbrains.annotations.Nullable;
+import org.objectweb.asm.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.concurrent.atomic.AtomicReferenceArray;
+
+@Mixin(Minecraft.class)
+public class MinecraftMixin {
+    @Shadow @Nullable public ClientLevel level;
+
+    /**
+     * To mitigate the effect of leaked client worlds, clear most of the data structures that waste memory.
+     */
+    @Inject(method = "clearLevel(Lnet/minecraft/client/gui/screens/Screen;)V", at = @At(value = "FIELD", opcode = Opcodes.PUTFIELD, target = "Lnet/minecraft/client/Minecraft;level:Lnet/minecraft/client/multiplayer/ClientLevel;"))
+    private void clearLevelDataForLeaks(CallbackInfo ci) {
+        if(this.level != null) {
+            try {
+                AtomicReferenceArray<LevelChunk> chunks = this.level.getChunkSource().storage.chunks;
+                for(int i = 0; i < chunks.length(); i++) {
+                    chunks.set(i, null);
+                }
+                this.level.getChunkSource().lightEngine = new LevelLightEngine(this.level.getChunkSource(), false, false);
+                // clear BE list otherwise they will hold chunks
+                this.level.blockEntityTickers.clear();
+            } catch(RuntimeException e) {
+                ModernFix.LOGGER.error("Exception clearing level data", e);
+            }
+        }
+    }
+}

common/src/main/java/org/embeddedt/modernfix/util/CanonizingStringMap.java

@@ -12,7 +12,7 @@ import java.util.Map;
  * Replacement backing map for CompoundTags that interns keys.
  */
 public class CanonizingStringMap<T> extends HashMap<String, T> {
-    private static final Interner<String> KEY_INTERNER = Interners.newStrongInterner();
+    private static final Interner<String> KEY_INTERNER = Interners.newWeakInterner();
 
     private static String intern(String key) {
         return key != null ? KEY_INTERNER.intern(key) : null;

common/src/main/resources/modernfix.accesswidener

@@ -1,5 +1,13 @@
 accessWidener   v2  named
 
+accessible field net/minecraft/client/multiplayer/ClientChunkCache storage Lnet/minecraft/client/multiplayer/ClientChunkCache$Storage;
+accessible field net/minecraft/client/multiplayer/ClientChunkCache lightEngine Lnet/minecraft/world/level/lighting/LevelLightEngine;
+mutable field net/minecraft/client/multiplayer/ClientChunkCache lightEngine Lnet/minecraft/world/level/lighting/LevelLightEngine;
+accessible class net/minecraft/client/multiplayer/ClientChunkCache$Storage
+accessible field net/minecraft/client/multiplayer/ClientChunkCache$Storage chunks Ljava/util/concurrent/atomic/AtomicReferenceArray;
+
+accessible field net/minecraft/world/level/Level blockEntityTickers Ljava/util/List;
+
 accessible class net/minecraft/client/renderer/RenderType$CompositeRenderType
 accessible method net/minecraft/nbt/CompoundTag <init> (Ljava/util/Map;)V
 

fabric/src/main/resources/fabric.mod.json

@@ -14,6 +14,15 @@
   },
   "license": "LGPL-3.0",
   "icon": "icon.png",
+  "custom": {
+    "modmenu": {
+      "links": {
+        "modmenu.kofi": "https://ko-fi.com/embeddedt",
+        "modmenu.github_releases": "https://github.com/embeddedt/ModernFix/releases",
+        "modmenu.curseforge": "https://www.curseforge.com/minecraft/mc-mods/modernfix"
+      }
+    }
+  },
   "environment": "*",
   "entrypoints": {
     "main": [