From 7277fd6218212ec40de9f54c3bc4e1b3579c3bb6 Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <seth@kipro-pcb.com>
Date: Fri, 28 Jan 2022 15:18:05 -0800
Subject: [PATCH] Don't allow degenerate lines in dragger

If walkaround returns an invalid line, don't consider it for a track

Fixes https://gitlab.com/kicad/code/kicad/issues/9555

(cherry picked from commit 8ae304dcca1f2e44073d7669699c5c894ef77ebb)
---
 pcbnew/router/pns_dragger.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pcbnew/router/pns_dragger.cpp b/pcbnew/router/pns_dragger.cpp
index e7a4f8ea22..afcdf8d133 100644
--- a/pcbnew/router/pns_dragger.cpp
+++ b/pcbnew/router/pns_dragger.cpp
@@ -511,12 +511,12 @@ bool DRAGGER::tryWalkaround( NODE* aNode, LINE& aOrig, LINE& aWalk )
                                                                              wr.lineCcw );
         ok    = true;
     }
-    else if( wr.statusCw == WALKAROUND::DONE )
+    else if( wr.statusCw == WALKAROUND::DONE && wr.lineCw.CLine().PointCount() > 1 )
     {
         aWalk = wr.lineCw;
         ok    = true;
     }
-    else if( wr.statusCcw == WALKAROUND::DONE )
+    else if( wr.statusCcw == WALKAROUND::DONE && wr.lineCcw.CLine().PointCount() > 1  )
     {
         aWalk = wr.lineCcw;
         ok    = true;