From 19d8dcad8b12f2da71ca78958df3c8ada31663ed Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Thu, 15 Sep 2022 18:15:48 +0100
Subject: [PATCH] Don't hang when filling degenerate zones.

---
 pcbnew/zone_filler.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pcbnew/zone_filler.cpp b/pcbnew/zone_filler.cpp
index e0717f0501..335375cc65 100644
--- a/pcbnew/zone_filler.cpp
+++ b/pcbnew/zone_filler.cpp
@@ -154,6 +154,10 @@ bool ZONE_FILLER::Fill( std::vector<ZONE*>& aZones, bool aCheck, wxWindow* aPare
         if( zone->GetIsRuleArea() )
             continue;
 
+        // Degenerate zones will cause trouble; skip them
+        if( zone->GetNumCorners() <= 2 )
+            continue;
+
         if( m_commit )
             m_commit->Modify( zone );
 
@@ -243,6 +247,7 @@ bool ZONE_FILLER::Fill( std::vector<ZONE*>& aZones, bool aCheck, wxWindow* aPare
                 if( zoneLock.owns_lock() )
                 {
                     SHAPE_POLY_SET fillPolys;
+
                     if( !fillSingleZone( zone, layer, fillPolys ) )
                         return 0;