From f2709e635f5490138f93c8ed401de6686bcc685f Mon Sep 17 00:00:00 2001
From: nds <nds@opencascade.com>
Date: Fri, 17 Jun 2016 11:21:56 +0300
Subject: [PATCH] Issue #1550 Correction for external objects, case: Create
 extrusion(on circle), start Sketch, select top face of the extrusion, create
 Projection, Start Equal, select circle of Projection. Result: field is filled
 by the projection though a projection is not shown in the viewer.

---
 src/PartSet/PartSet_ExternalObjectsMgr.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/PartSet/PartSet_ExternalObjectsMgr.cpp b/src/PartSet/PartSet_ExternalObjectsMgr.cpp
index 98bcf3d1c..c636f5b3b 100755
--- a/src/PartSet/PartSet_ExternalObjectsMgr.cpp
+++ b/src/PartSet/PartSet_ExternalObjectsMgr.cpp
@@ -47,6 +47,16 @@ ObjectPtr PartSet_ExternalObjectsMgr::externalObject(const ObjectPtr& theSelecte
 {
   ObjectPtr aSelectedObject = PartSet_Tools::findFixedObjectByExternal(
                                   theShape->impl<TopoDS_Shape>(), theSelectedObject, theSketch);
+  FeaturePtr aFeature = ModelAPI_Feature::feature(aSelectedObject);
+  if (aFeature.get()) {
+    std::shared_ptr<SketchPlugin_Feature> aSketchFeature =
+                            std::dynamic_pointer_cast<SketchPlugin_Feature>(aFeature);
+    /// some sketch entities should be never shown, e.g. projection feature
+    /// such external features should not be used in selection
+    if (aSketchFeature.get() && !aSketchFeature->canBeDisplayed())
+      return ObjectPtr();
+  }
+
   if (!aSelectedObject.get()) {
     // Processing of external (non-sketch) object
     aSelectedObject = PartSet_Tools::createFixedObjectByExternal(theShape->impl<TopoDS_Shape>(),
-- 
2.39.2