fix: rect selections are broken by previews

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   mode)
 - [#441] Fixed an issue where the preview object pickable status could get out of sync with the original
 - [#444] Fixed an issue where the preview system broke drag-and-drop of materials onto the scene view
+- [#444] Fixed an issue where the preview system broke drag-to-select in the scene view
 
 ### Changed
 - [#451] Changed preview system to apply to more cameras. Specifically, we now handle all cameras with no render

Editor/Harmony/HandleUtilityPatches.cs

@@ -92,6 +92,15 @@ internal static void Patch_FilterInstanceIDs(Harmony h)
                 new HarmonyMethod(m_prefix_internal_getclosestpickingid),
                 new HarmonyMethod(m_postfix_internal_getclosestpickingid)
             );
+
+            var m_internal_pickrectobjects = AccessTools.Method(t_HandleUtility, "Internal_PickRectObjects");
+            var m_postfix_internal_pickrectobjects = AccessTools.Method(typeof(HandleUtilityPatches),
+                nameof(Postfix_Internal_PickRectObjects));
+
+            h.Patch(
+                m_internal_pickrectobjects,
+                postfix: new HarmonyMethod(m_postfix_internal_pickrectobjects)
+            );
         }
 
         private static readonly Type ty_PickingObject = AccessTools.TypeByName("UnityEditor.PickingObject");
@@ -167,6 +176,29 @@ ref uint __result
             }
         }
 
+        [UsedImplicitly]
+        private static void Postfix_Internal_PickRectObjects(
+            Camera cam,
+            Rect rect,
+            bool selectPrefabRoots,
+            bool drawGizmos,
+            ref GameObject[] __result
+        )
+        {
+            if (__result == null) return;
+
+            var sess = PreviewSession.Current;
+            if (sess == null) return;
+
+            for (var i = 0; i < __result.Length; i++)
+            {
+                if (sess.ProxyToOriginalObject.TryGetValue(__result[i], out var original) && original != null)
+                {
+                    __result[i] = original;
+                }
+            }
+        }
+
         [UsedImplicitly]
         private static bool Prefix_FilterInstanceIDs(
             ref IEnumerable<GameObject> gameObjects,