Paper/patches/server/0771-Fix-setPatternColor-on-tropical-fish-bucket-meta.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Bjarne Koll <lynxplay101@gmail.com>
Date: Sat, 6 Nov 2021 23:15:20 +0100
Subject: [PATCH] Fix setPatternColor on tropical fish bucket meta

Prior to this commit, the tropical fish bucket meta would set the body
color to the previous metas pattern colour when updating the pattern
colour.

This commit hence simply fixes this by using the proper body colour
value when updating the pattern color.

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
index 41eca0171faa5dc03b4e426a75f29b7bb4c3f6e2..acdc5c81850f9191061d4a804bd3524e717d24a2 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaTropicalFishBucket.java
@@ -113,7 +113,7 @@ class CraftMetaTropicalFishBucket extends CraftMetaItem implements TropicalFishB
         if (this.variant == null) {
             this.variant = 0;
         }
-        this.variant = CraftTropicalFish.getData(color, this.getPatternColor(), this.getPattern());
+        this.variant = CraftTropicalFish.getData(color, this.getBodyColor(), this.getPattern()); // Paper - properly set tropical fish pattern color without mutating body color
     }
 
     @Override
diff --git a/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java b/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..2e7f8ef88ae74c7cbfdb7f397951cbc8479a995f
--- /dev/null
+++ b/src/test/java/io/papermc/paper/inventory/CraftMetaTropicalFishBucketTest.java
@@ -0,0 +1,40 @@
+package io.papermc.paper.inventory;
+
+import org.bukkit.DyeColor;
+import org.bukkit.Material;
+import org.bukkit.entity.TropicalFish;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.TropicalFishBucketMeta;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CraftMetaTropicalFishBucketTest extends AbstractTestingBase {
+
+    @Test
+    public void testAllCombinations() {
+        final var rawMeta = new ItemStack(Material.TROPICAL_FISH_BUCKET).getItemMeta();
+        Assert.assertTrue("Meta was not a tropical fish bucket", rawMeta instanceof TropicalFishBucketMeta);
+
+        final var meta = (TropicalFishBucketMeta) rawMeta;
+
+        for (final var bodyColor : DyeColor.values()) {
+            for (final var pattern : TropicalFish.Pattern.values()) {
+                for (final var patternColor : DyeColor.values()) {
+                    meta.setBodyColor(bodyColor);
+                    Assert.assertEquals("Body color did not match post body color!", bodyColor, meta.getBodyColor());
+
+                    meta.setPattern(pattern);
+                    Assert.assertEquals("Pattern did not match post pattern!", pattern, meta.getPattern());
+                    Assert.assertEquals("Body color did not match post pattern!", bodyColor, meta.getBodyColor());
+
+                    meta.setPatternColor(patternColor);
+                    Assert.assertEquals("Pattern did not match post pattern color!", pattern, meta.getPattern());
+                    Assert.assertEquals("Body color did not match post pattern color!", bodyColor, meta.getBodyColor());
+                    Assert.assertEquals("Pattern color did not match post pattern color!", patternColor, meta.getPatternColor());
+                }
+            }
+        }
+    }
+
+}