Fix usage of FluidStack as keys in maps or sets not properly comparing

src/main/java/mekanism/client/render/tileentity/RenderFluidTank.java

@@ -4,7 +4,7 @@
 import com.mojang.blaze3d.vertex.VertexConsumer;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
-import java.util.HashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenCustomHashMap;
 import java.util.Map;
 import mekanism.api.annotations.NothingNullByDefault;
 import mekanism.client.render.MekanismRenderer;
@@ -13,6 +13,7 @@
 import mekanism.client.render.ModelRenderer;
 import mekanism.client.render.RenderResizableCuboid.FaceDisplay;
 import mekanism.common.base.ProfilerConstants;
+import mekanism.common.lib.collection.FluidHashStrategy;
 import mekanism.common.tile.TileEntityFluidTank;
 import mekanism.common.util.MekanismUtils;
 import net.minecraft.client.renderer.MultiBufferSource;
@@ -26,8 +27,8 @@
 @NothingNullByDefault
 public class RenderFluidTank extends MekanismTileEntityRenderer<TileEntityFluidTank> {
 
-    private static final Map<FluidStack, Int2ObjectMap<Model3D>> cachedCenterFluids = new HashMap<>();
-    private static final Map<FluidStack, Int2ObjectMap<Model3D>> cachedValveFluids = new HashMap<>();
+    private static final Map<FluidStack, Int2ObjectMap<Model3D>> cachedCenterFluids = new Object2ObjectOpenCustomHashMap<>(FluidHashStrategy.INSTANCE);
+    private static final Map<FluidStack, Int2ObjectMap<Model3D>> cachedValveFluids = new Object2ObjectOpenCustomHashMap<>(FluidHashStrategy.INSTANCE);
 
     private static final int stages = 1_400;
 

src/main/java/mekanism/client/render/transmitter/RenderMechanicalPipe.java

@@ -5,8 +5,8 @@
 import it.unimi.dsi.fastutil.ints.Int2ObjectArrayMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenCustomHashMap;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -20,6 +20,7 @@
 import mekanism.common.base.ProfilerConstants;
 import mekanism.common.content.network.FluidNetwork;
 import mekanism.common.content.network.transmitter.MechanicalPipe;
+import mekanism.common.lib.collection.FluidHashStrategy;
 import mekanism.common.lib.transmitter.ConnectionType;
 import mekanism.common.tile.transmitter.TileEntityMechanicalPipe;
 import mekanism.common.util.EnumUtils;
@@ -43,7 +44,6 @@ public class RenderMechanicalPipe extends RenderTransmitterBase<TileEntityMechan
     private static final float offset = 0.02F;
     //Note: this is basically used as an enum map (Direction), but null key is possible, which EnumMap doesn't support.
     // 6 is used for null side, and 7 is used for null side but flowing vertically
-    //TODO - 1.20.5: Look at all maps and sets that use FluidStacks as keys as they no longer are hashed
     private static final Int2ObjectMap<Map<FluidStack, Int2ObjectMap<Model3D>>> cachedLiquids = new Int2ObjectArrayMap<>(8);
 
     public RenderMechanicalPipe(BlockEntityRendererProvider.Context context) {
@@ -142,7 +142,7 @@ private Model3D getModel(@Nullable Direction side, FluidStack fluid, int stage,
         } else {
             sideOrdinal = side.ordinal();
         }
-        Int2ObjectMap<Model3D> modelMap = cachedLiquids.computeIfAbsent(sideOrdinal, s -> new HashMap<>())
+        Int2ObjectMap<Model3D> modelMap = cachedLiquids.computeIfAbsent(sideOrdinal, s -> new Object2ObjectOpenCustomHashMap<>(FluidHashStrategy.INSTANCE))
               .computeIfAbsent(fluid, f -> new Int2ObjectOpenHashMap<>());
         Model3D model = modelMap.get(stage);
         if (model == null) {

src/main/java/mekanism/common/inventory/slot/IFluidHandlerSlot.java

@@ -1,21 +1,21 @@
 package mekanism.common.inventory.slot;
 
-import java.util.HashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenCustomHashMap;
+import java.util.Collection;
 import java.util.Map;
-import java.util.Set;
 import mekanism.api.Action;
 import mekanism.api.AutomationType;
 import mekanism.api.fluid.IExtendedFluidTank;
 import mekanism.api.inventory.IInventorySlot;
 import mekanism.common.capabilities.Capabilities;
+import mekanism.common.lib.collection.FluidHashStrategy;
 import mekanism.common.tile.interfaces.IFluidContainerManager.ContainerEditMode;
 import mekanism.common.util.MekanismUtils;
 import net.minecraft.world.item.ItemStack;
 import net.neoforged.neoforge.fluids.FluidStack;
 import net.neoforged.neoforge.fluids.capability.IFluidHandler;
 import net.neoforged.neoforge.fluids.capability.IFluidHandler.FluidAction;
 import net.neoforged.neoforge.fluids.capability.IFluidHandlerItem;
-import net.neoforged.neoforge.items.ItemHandlerHelper;
 
 public interface IFluidHandlerSlot extends IInventorySlot {
 
@@ -88,9 +88,8 @@ default void fillTank(IInventorySlot outputSlot) {
                 //If we have more than one tank in our item then handle calculating the different drains that will occur for filling our fluid handler
                 // We start by gathering all the fluids in the item that we are able to drain and are valid for the tank,
                 // combining same fluid types into a single fluid stack
-                Set<FluidStack> knownFluids = gatherKnownFluids(itemFluidHandler, itemTanks);
                 //If we found any fluids that we can drain, attempt to drain them into our item
-                for (FluidStack knownFluid : knownFluids) {
+                for (FluidStack knownFluid : gatherKnownFluids(itemFluidHandler, itemTanks)) {
                     if (drainItemAndMove(outputSlot, knownFluid) && isEmpty()) {
                         //If we moved the item after draining it and we now don't have an item to try and fill
                         // then just exit instead of checking the other types of fluids
@@ -261,7 +260,7 @@ default boolean fillTank() {
                     //If we have more than one tank in our item then handle calculating the different drains that will occur for filling our fluid handler
                     // We start by gathering all the fluids in the item that we are able to drain and are valid for the tank,
                     // combining same fluid types into a single fluid stack
-                    Set<FluidStack> knownFluids = gatherKnownFluids(itemFluidHandler, tanks);
+                    Collection<FluidStack> knownFluids = gatherKnownFluids(itemFluidHandler, tanks);
                     if (!knownFluids.isEmpty()) {
                         //If we found any fluids that we can drain, attempt to drain them into our item
                         boolean changed = false;
@@ -282,8 +281,8 @@ default boolean fillTank() {
         return false;
     }
 
-    private Set<FluidStack> gatherKnownFluids(IFluidHandlerItem itemFluidHandler, int tanks) {
-        Map<FluidStack, FluidStack> knownFluids = new HashMap<>();
+    private Collection<FluidStack> gatherKnownFluids(IFluidHandlerItem itemFluidHandler, int tanks) {
+        Map<FluidStack, FluidStack> knownFluids = new Object2ObjectOpenCustomHashMap<>(FluidHashStrategy.INSTANCE);
         for (int tank = 0; tank < tanks; tank++) {
             FluidStack fluidInItem = itemFluidHandler.getFluidInTank(tank);
             if (!fluidInItem.isEmpty()) {

src/main/java/mekanism/common/lib/collection/FluidHashStrategy.java

@@ -0,0 +1,22 @@
+package mekanism.common.lib.collection;
+
+import it.unimi.dsi.fastutil.Hash.Strategy;
+import net.neoforged.neoforge.fluids.FluidStack;
+
+public class FluidHashStrategy implements Strategy<FluidStack> {
+
+    public static final FluidHashStrategy INSTANCE = new FluidHashStrategy();
+
+    private FluidHashStrategy() {
+    }
+
+    @Override
+    public int hashCode(FluidStack stack) {
+        return FluidStack.hashFluidAndComponents(stack);
+    }
+
+    @Override
+    public boolean equals(FluidStack a, FluidStack b) {
+        return FluidStack.isSameFluidSameComponents(a, b);
+    }
+}