Fix unintended upgrading of Draconic Modifiers

src/main/java/io/github/lxgaming/sledgehammer/configuration/category/mixin/TinkersEvolutionMixinCategory.java

@@ -23,10 +23,18 @@
 @ConfigSerializable
 public class TinkersEvolutionMixinCategory {
 
+    @Mapping(value = "tconevo.trait.draconicevolution.TraitEvolvedMixin", dependencies = "tconevo")
+    @Setting(value = "draconic-upgrade", comment = "If 'true', fixes unintended upgrading of Draconic Modifiers")
+    private boolean draconicUpgrade = false;
+
     @Mapping(value = "tconevo.integration.redstonerepository.RedstoneRepositoryHooksImplMixin", dependencies = "tconevo")
     @Setting(value = "redstone-repository", comment = "If 'true', fixes NoClassDefFoundError with Redstone Repository")
     private boolean redstoneRepository = false;
 
+    public boolean isDraconicUpgrade() {
+        return draconicUpgrade;
+    }
+
     public boolean isRedstoneRepository() {
         return redstoneRepository;
     }

src/main/java/io/github/lxgaming/sledgehammer/mixin/tconevo/trait/draconicevolution/TraitEvolvedMixin.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2023 Alex Thomson
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.github.lxgaming.sledgehammer.mixin.tconevo.trait.draconicevolution;
+
+import net.minecraft.nbt.NBTTagCompound;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import slimeknights.tconstruct.library.utils.TinkerUtil;
+import xyz.phanta.tconevo.trait.draconicevolution.ModifierDraconic;
+import xyz.phanta.tconevo.trait.draconicevolution.TraitEvolved;
+
+@Mixin(value = TraitEvolved.class, remap = false)
+public abstract class TraitEvolvedMixin {
+
+    @Redirect(
+            method = "applyEffect",
+            at = @At(
+                    value = "INVOKE",
+                    target = "Lxyz/phanta/tconevo/trait/draconicevolution/ModifierDraconic;apply(Lnet/minecraft/nbt/NBTTagCompound;)V"
+            )
+    )
+    private void onApply(ModifierDraconic mod, NBTTagCompound rootCompound, NBTTagCompound modifierTag) {
+        if (!TinkerUtil.hasTrait(rootCompound, mod.identifier)) {
+            mod.apply(rootCompound);
+        }
+    }
+}

src/main/resources/mixins.sledgehammer.tconevo.json

@@ -7,7 +7,8 @@
   "target": "@env(DEFAULT)",
   "compatibilityLevel": "JAVA_8",
   "mixins": [
-    "integration.redstonerepository.RedstoneRepositoryHooksImplMixin"
+    "integration.redstonerepository.RedstoneRepositoryHooksImplMixin",
+    "trait.draconicevolution.TraitEvolvedMixin"
   ],
   "injectors": {
     "defaultRequire": 1