From 6c5a4baa89f4847ca56f5dd0666158f145fc3d66 Mon Sep 17 00:00:00 2001
From: mpv <mikhail.ponikarov@opencascade.com>
Date: Mon, 19 May 2014 15:37:28 +0400
Subject: [PATCH] Fix for visualization of "Redo" in sketch crash

---
 src/PartSet/PartSet_OperationSketchBase.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/PartSet/PartSet_OperationSketchBase.cpp b/src/PartSet/PartSet_OperationSketchBase.cpp
index 9eac6c82a..0dd6efc90 100644
--- a/src/PartSet/PartSet_OperationSketchBase.cpp
+++ b/src/PartSet/PartSet_OperationSketchBase.cpp
@@ -5,6 +5,7 @@
 #include <PartSet_OperationSketchBase.h>
 
 #include <SketchPlugin_Feature.h>
+#include <Model_Object.h>
 
 #include <V3d_View.hxx>
 
@@ -29,6 +30,12 @@ boost::shared_ptr<GeomAPI_Shape> PartSet_OperationSketchBase::preview(
 {
   boost::shared_ptr<SketchPlugin_Feature> aFeature = 
                               boost::dynamic_pointer_cast<SketchPlugin_Feature>(theFeature);
+  if (!aFeature) { // if it is reference to a object feature
+    boost::shared_ptr<Model_Object> anObj = 
+      boost::dynamic_pointer_cast<Model_Object>(theFeature);
+    if (anObj) 
+      aFeature = boost::dynamic_pointer_cast<SketchPlugin_Feature>(anObj->featureRef());
+  }
   return aFeature->preview();
 }
 
-- 
2.39.2