fix: Merge Animator in replace mode breaks Merge Blend Tree (#1488)

Editor/MergeAnimatorProcessor.cs

@@ -104,7 +104,8 @@ namespace nadena.dev.modular_avatar.core.editor
             else if (replacements == 1)
             {
                 // Delete all pre-existing layers.
-                controller.RemoveLayers(_ => true);
+                // Retain the blend tree layer, since that will generally be placed as the first layer in the animator
+                controller.RemoveLayers(l => l.Name != MergeBlendTreePass.BlendTreeLayerName);
 
                 // Merge just the first controller (the one that replaces)
                 MergeSingle(context, controller, sorted.First(), null);

UnitTests~/MergeAnimatorTests/Replacement/MergeAnimatorReplacementTest.cs

@@ -1,6 +1,7 @@
 using System.Linq;
 using modular_avatar_tests;
 using nadena.dev.modular_avatar.core;
+using nadena.dev.modular_avatar.core.editor;
 using nadena.dev.ndmf;
 using NUnit.Framework;
 using UnityEditor.Animations;
@@ -54,5 +55,18 @@ namespace UnitTests.MergeAnimatorTests.Replacement
             Assert.AreEqual("error.merge_animator.multiple_replacements", err.TitleKey);
             Assert.AreEqual(2, err._references.Count());
         }
+
+        [Test]
+        public void ReplacementPreservesMergedBlendTrees()
+        {
+            var prefab = CreatePrefab("ReplacePreservesMergedBlendTrees.prefab");
+            
+            AvatarProcessor.ProcessAvatar(prefab);
+            
+            var fx = FindFxController(prefab);
+            var fxc = (AnimatorController)fx.animatorController;
+            
+            Assert.IsTrue(fxc.layers.Any(l => l.name == MergeBlendTreePass.BlendTreeLayerName));
+        }
     }
 }

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