Reapply "perf(rendering): draw retained frame product"

This reverts commit 2c848d4167.

tests/AcDream.App.Tests/Rendering/ArchRenderSceneTests.cs

@@ -575,6 +575,62 @@ public sealed class ArchRenderSceneTests
         Assert.True(scene.Memory.EstimatedIndexBytes > 0);
     }
 
+    [Fact]
+    public void IndexRevision_AdvancesOnlyWhenOrderedMembershipCanChange()
+    {
+        RenderSceneGeneration generation = Generation(18);
+        using var scene = new ArchRenderScene(generation);
+        RenderProjectionRecord original = Record(
+            18,
+            1,
+            RenderProjectionClass.OutdoorStatic);
+        scene.Apply(
+            [RenderProjectionDelta.Register(generation, 1, original)]);
+        scene.ClearDirty();
+        ulong registeredRevision = scene.OpenQuery().IndexRevision;
+
+        Matrix4x4 movedTransform =
+            Matrix4x4.CreateTranslation(4, 5, 6);
+        RenderProjectionRecord moved = original with
+        {
+            Transform = new RenderTransform(movedTransform),
+            PreviousTransform =
+                new PreviousRenderTransform(
+                    original.Transform.LocalToWorld),
+            Bounds = new RenderWorldBounds(
+                new Vector3(3, 4, 5),
+                new Vector3(5, 6, 7)),
+        };
+        scene.Apply(
+        [
+            RenderProjectionDelta.Update(
+                RenderProjectionDeltaKind.UpdateTransform,
+                generation,
+                2,
+                moved),
+        ]);
+
+        RenderSceneQuery movedQuery = scene.OpenQuery();
+        Assert.Equal(registeredRevision, movedQuery.IndexRevision);
+        Assert.Equal(1, movedQuery.IndexCounts.Dirty);
+
+        RenderProjectionRecord reordered = moved with
+        {
+            SortKey = new RenderSortKey(moved.SortKey.Value + 1),
+        };
+        scene.Apply(
+        [
+            RenderProjectionDelta.Update(
+                RenderProjectionDeltaKind.UpdateTransform,
+                generation,
+                3,
+                reordered),
+        ]);
+
+        Assert.True(
+            scene.OpenQuery().IndexRevision > registeredRevision);
+    }
+
     private static RenderProjectionRecord Record(
         ulong id,
         ulong incarnation,