From 8d68cde576149aaad4b50972d8fc98a8eea6f926 Mon Sep 17 00:00:00 2001
From: Roman Telezhynskyi <dismine@gmail.com>
Date: Tue, 2 Jun 2020 16:35:40 +0300
Subject: [PATCH] Don't show null lines. smart-pattern/valentina#32.

If both points, start and end, of a line are equal such a line is invalid. To avoid incorrect representation do not draw it.
---
 src/libs/vtools/visualization/visualization.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/libs/vtools/visualization/visualization.cpp b/src/libs/vtools/visualization/visualization.cpp
index b867dbbbd..9c75dc178 100644
--- a/src/libs/vtools/visualization/visualization.cpp
+++ b/src/libs/vtools/visualization/visualization.cpp
@@ -253,8 +253,12 @@ void Visualization::DrawLine(VScaledLine *lineItem, const QLineF &line, const QC
     visPen.setStyle(style);
 
     lineItem->setPen(visPen);
-    lineItem->setLine(line);
-    lineItem->setVisible(true);
+    if (not line.isNull())
+    {
+        lineItem->setLine(line);
+    }
+
+    lineItem->setVisible(not line.isNull());
 }
 
 //---------------------------------------------------------------------------------------------------------------------