From efe58ca8f577124705612ebfc341f38301c24611 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Fri, 18 Oct 2019 15:36:35 +0300
Subject: [PATCH] Issue #3052: Conflicting constraint after trim ellipse

Prefer make coincident the boundary of the trimmed feature with an edge instead of point, because it decreases only 1 DoF.
---
 src/SketchPlugin/SketchPlugin_Trim.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/SketchPlugin/SketchPlugin_Trim.cpp b/src/SketchPlugin/SketchPlugin_Trim.cpp
index 33ff36ab4..b7d0535db 100644
--- a/src/SketchPlugin/SketchPlugin_Trim.cpp
+++ b/src/SketchPlugin/SketchPlugin_Trim.cpp
@@ -372,7 +372,19 @@ void SketchPlugin_Trim::execute()
     {
       if (aRefIt->first->isEqual(aPoint)) {
         anInfo = aRefIt->second;
-        break;
+        // prefer a segment instead of a point, because further coincidence with a segment
+        // decreases only 1 DoF (instead of 2 for point) and prevents an overconstraint situation.
+        bool isEdge = false;
+        for (std::list<ObjectPtr>::const_iterator anIt = anInfo.second.begin();
+             anIt != anInfo.second.end() && !isEdge; ++anIt) {
+          ResultPtr aResult = std::dynamic_pointer_cast<ModelAPI_Result>(*anIt);
+          if (aResult) {
+            GeomShapePtr aShape = aResult->shape();
+            isEdge = aShape && aShape->isEdge();
+          }
+        }
+        if (isEdge)
+          break;
       }
     }
     const std::list<ObjectPtr>& anObjects = anInfo.second;
-- 
2.39.2