From e10a57b537d0f1408485f71f179a1d212b9d94d3 Mon Sep 17 00:00:00 2001
From: SashaRX <SashaRX@ya.ru>
Date: Thu, 6 Aug 2026 13:45:44 +0200
Subject: [PATCH] Restore preview meshes before undo refresh

---
 Editor/Framework/UvToolHub.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Editor/Framework/UvToolHub.cs b/Editor/Framework/UvToolHub.cs
index 55d0fa29..fb1e4f8c 100644
--- a/Editor/Framework/UvToolHub.cs
+++ b/Editor/Framework/UvToolHub.cs
@@ -276,6 +276,13 @@ void OnUndoRedo()
         {
             if (ctx == null) return;
 
+            // Preview modes can temporarily replace MeshFilter.sharedMesh. Restore
+            // those swaps and the imported meshes before rebuilding MeshEntries,
+            // otherwise Refresh can cache a preview mesh as the new baseline.
+            if (canvas.CurrentPreviewMode != UvCanvasView.PreviewMode.Off)
+                ApplyPreviewMode(UvCanvasView.PreviewMode.Off);
+            RestoreWorkingMeshes();
+
             if (ctx.LodGroup != null)
             {
                 ctx.Refresh(ctx.LodGroup);