From 4acc336d69e78a63132cdb5b22f983e90110a9eb Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@koefferlein.de>
Date: Wed, 11 Apr 2018 22:53:55 +0200
Subject: [PATCH] Fixed DXF display issue (see
 https://www.klayout.de/forum/comments.php?DiscussionID=1053)

---
 src/db/db/dbShapes.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/db/db/dbShapes.cc b/src/db/db/dbShapes.cc
index 274a2a2e9..ef848cdc1 100644
--- a/src/db/db/dbShapes.cc
+++ b/src/db/db/dbShapes.cc
@@ -120,7 +120,10 @@ Shapes::operator= (const Shapes &d)
 {
   if (&d != this) {
     clear ();
-    do_insert (d);
+    if (! d.empty()) {
+      invalidate_state ();
+      do_insert (d);
+    }
   }
 
   return *this;