Fix compilation errors and warnings caused by prefabs-related changes in the API.

Assets/Examples/Editor/NavMeshPrefabInstanceEditor.cs

@@ -45,7 +45,7 @@ void OnInspectorGUIPrefab(GameObject go)
         {
             if (GUILayout.Button("Select the Prefab asset to bake or clear the navmesh", EditorStyles.helpBox))
             {
-                Selection.activeObject = PrefabUtility.GetPrefabParent(go);
+                Selection.activeObject = PrefabUtility.GetCorrespondingObjectFromSource(go);
                 EditorGUIUtility.PingObject(Selection.activeObject);
             }
         }
@@ -71,7 +71,7 @@ NavMeshData Build(NavMeshPrefabInstance instance)
         var sources = new List<NavMeshBuildSource>();
         var markups = new List<NavMeshBuildMarkup>();
 
-        NavMeshBuilder.CollectSources(root, ~0, NavMeshCollectGeometry.RenderMeshes, 0, markups, sources);
+        NavMeshBuilder.CollectSources(root, ~0, NavMeshCollectGeometry.RenderMeshes, 0, markups, instance.gameObject.scene, sources);
         var settings = NavMesh.GetSettingsByID(0);
         var bounds = new Bounds(Vector3.zero, 1000.0f * Vector3.one);
         var navmesh = NavMeshBuilder.BuildNavMeshData(settings, sources, bounds, root.position, root.rotation);

Assets/NavMeshComponents/Editor/NavMeshSurfaceEditor.cs

@@ -110,11 +110,10 @@ static void CreateNavMeshAsset(NavMeshSurface surface)
 
         static NavMeshData GetNavMeshAssetToDelete(NavMeshSurface navSurface)
         {
-            var prefabType = PrefabUtility.GetPrefabType(navSurface);
-            if (prefabType == PrefabType.PrefabInstance || prefabType == PrefabType.DisconnectedPrefabInstance)
+            if (PrefabUtility.IsPartOfPrefabInstance(navSurface) && !PrefabUtility.IsPartOfModelPrefab(navSurface))
             {
                 // Don't allow deleting the asset belonging to the prefab parent
-                var parentSurface = PrefabUtility.GetPrefabParent(navSurface) as NavMeshSurface;
+                var parentSurface = PrefabUtility.GetCorrespondingObjectFromSource(navSurface) as NavMeshSurface;
                 if (parentSurface && navSurface.navMeshData == parentSurface.navMeshData)
                     return null;
             }

Assets/NavMeshComponents/Scripts/NavMeshSurface.cs

 using System.Collections.Generic;
+using UnityEditor;
+using UnityEditor.SceneManagement;
 
 namespace UnityEngine.AI
 {
@@ -252,6 +254,7 @@ List<NavMeshBuildSource> CollectSources()
                 modifiers = NavMeshModifier.activeModifiers;
             }
 
+            var scene = gameObject.scene;
             foreach (var m in modifiers)
             {
                 if ((m_LayerMask & (1 << m.gameObject.layer)) == 0)
@@ -268,17 +271,17 @@ List<NavMeshBuildSource> CollectSources()
 
             if (m_CollectObjects == CollectObjects.All)
             {
-                NavMeshBuilder.CollectSources(null, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                NavMeshBuilder.CollectSources(null, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, scene, sources);
             }
             else if (m_CollectObjects == CollectObjects.Children)
             {
-                NavMeshBuilder.CollectSources(transform, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                NavMeshBuilder.CollectSources(transform, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, scene, sources);
             }
             else if (m_CollectObjects == CollectObjects.Volume)
             {
                 Matrix4x4 localToWorld = Matrix4x4.TRS(transform.position, transform.rotation, Vector3.one);
                 var worldBounds = GetWorldBounds(localToWorld, new Bounds(m_Center, m_Size));
-                NavMeshBuilder.CollectSources(worldBounds, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, sources);
+                NavMeshBuilder.CollectSources(worldBounds, m_LayerMask, m_UseGeometry, m_DefaultArea, markups, scene, sources);
             }
 
             if (m_IgnoreNavMeshAgent)
@@ -368,8 +371,9 @@ bool UnshareNavMeshAsset()
                 return false;
 
             // Prefab parent owns the asset reference
-            var prefabType = UnityEditor.PrefabUtility.GetPrefabType(this);
-            if (prefabType == UnityEditor.PrefabType.Prefab)
+            var isInPreviewScene = EditorSceneManager.IsPreviewSceneObject(this);
+            var isPersistentObject = EditorUtility.IsPersistent(this);
+            if (isInPreviewScene || isPersistentObject)
                 return false;
 
             // An instance can share asset reference only with its prefab parent