From aa9cd0d91c1db88bf2999a08987a31894e67f7f1 Mon Sep 17 00:00:00 2001
From: Abdullah Tahiri <abdullah.tahiri.yo@gmail.com>
Date: Sat, 8 Jun 2019 14:16:44 +0200
Subject: [PATCH] Partial Restore: ensure line segment length when x coordinate
 is exactly zero

fixes #4012
---
 src/Mod/Part/App/Geometry.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Part/App/Geometry.cpp b/src/Mod/Part/App/Geometry.cpp
index 8e949a47eb..2fe18c9972 100644
--- a/src/Mod/Part/App/Geometry.cpp
+++ b/src/Mod/Part/App/Geometry.cpp
@@ -3752,7 +3752,13 @@ void GeomLineSegment::Restore    (Base::XMLReader &reader)
         // the points are too close. The best try to restore is incrementing the distance.
         // for other objects, the best effort may be just to leave default values.
         reader.setPartialRestore(true);
-        end = start + Base::Vector3d(start.x*DBL_EPSILON,0,0);
+
+        if(start.x == 0) {
+            end = start + Base::Vector3d(DBL_EPSILON,0,0);
+        }
+        else {
+            end = start + Base::Vector3d(start.x*DBL_EPSILON,0,0);
+        }
 
         setPoints(start, end);
     }