From 1abdd41c29b3e48fbcb4ab59fd5e2e4e3ec89c14 Mon Sep 17 00:00:00 2001
From: kgv <kgv@opencascade.com>
Date: Mon, 23 Nov 2020 17:58:01 +0300
Subject: [PATCH] 0031955: Visualization - Graphic3d_CView::Erase() should
 always remove structure from myStructsToCompute [OCCT 7.2.0 backport]

---
 src/Graphic3d/Graphic3d_CView.cxx | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/Graphic3d/Graphic3d_CView.cxx b/src/Graphic3d/Graphic3d_CView.cxx
index 2a0e8032ac..24f64919ad 100644
--- a/src/Graphic3d/Graphic3d_CView.cxx
+++ b/src/Graphic3d/Graphic3d_CView.cxx
@@ -847,24 +847,23 @@ void Graphic3d_CView::Erase (const Handle(Graphic3d_Structure)& theStructure)
     return;
   }
 
-  Graphic3d_TypeOfAnswer anAnswer = acceptDisplay (theStructure->Visual());
-  if (!ComputedMode())
-  {
-    anAnswer = Graphic3d_TOA_YES;
-  }
-
+  const Graphic3d_TypeOfAnswer anAnswer = myIsInComputedMode ? acceptDisplay (theStructure->Visual()) : Graphic3d_TOA_YES;
   if (anAnswer != Graphic3d_TOA_COMPUTE)
   {
     eraseStructure (theStructure->CStructure());
   }
-  else if (anAnswer == Graphic3d_TOA_COMPUTE && myIsInComputedMode)
+
+  const Standard_Integer anIndex = !myStructsToCompute.IsEmpty() ? IsComputed (theStructure) : 0;
+  if (anIndex != 0)
   {
-    const Standard_Integer anIndex = IsComputed (theStructure);
-    if (anIndex != 0)
+    if (anAnswer == Graphic3d_TOA_COMPUTE
+     && myIsInComputedMode)
     {
       const Handle(Graphic3d_Structure)& aCompStruct = myStructsComputed.ChangeValue (anIndex);
       eraseStructure (aCompStruct->CStructure());
     }
+    myStructsComputed .Remove (anIndex);
+    myStructsToCompute.Remove (anIndex);
   }
   myStructsDisplayed.Remove (theStructure);
   Update (theStructure->GetZLayer());