fix: layer cross-references are broken by empty layer pruning in some cases (#1075)

Fixes: #830

Editor/Animation/AnimatorCombiner.cs

@@ -302,6 +302,13 @@ namespace nadena.dev.modular_avatar.animation
 
         private void PruneEmptyLayers()
         {
+#if MA_VRCSDK3_AVATARS
+            // We can't safely correct the layer index of a VRCAnimatorLayerControl without knowing if it refers to
+            // _this_ animator controller, so just skip this. We'll do the empty layer pruning later when we merge
+            // everything together.
+            if (BlendableLayer == null) return;
+#endif
+            
             var originalLayers = _layers;
             int[] layerIndexMappings = new int[originalLayers.Count];
 

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UnitTests~/Animation/BaseLayerReferenceCorrection/BaseLayerReferenceCorrectionTest.cs

@@ -0,0 +1,29 @@
+using System.Linq;
+using nadena.dev.ndmf;
+using NUnit.Framework;
+using UnityEditor.Animations;
+using VRC.SDK3.Avatars.Components;
+
+namespace modular_avatar_tests
+{
+    public class BaseLayerReferenceCorrectionTest : TestBase
+    {
+        [Test]
+        public void whenBaseAnimatorLayersAreDeleted_layerCrossRefsAreCorrected()
+        {
+            var avatar = CreatePrefab("BaseLayerReferenceCorrection.prefab");
+            
+            AvatarProcessor.ProcessAvatar(avatar);
+
+            var fx = findFxLayer(avatar, "test");
+            var state = fx.stateMachine.defaultState;
+            var alc = state.behaviours[0] as VRCAnimatorLayerControl;
+            Assert.NotNull(alc);
+
+            var desiredIndex = ((AnimatorController)FindFxController(avatar).animatorController)
+                .layers.TakeWhile(l => l.name != "l1").Count();
+            
+            Assert.AreEqual(desiredIndex, alc.layer);
+        }
+    }
+}

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