From e4294aab85fb54d6290fb1a4692fea768996107b Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Tue, 10 Jun 2025 09:35:21 +0100
Subject: [PATCH] Don't export negative layers to copper.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20949
---
 gerbview/export_to_pcbnew.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gerbview/export_to_pcbnew.cpp b/gerbview/export_to_pcbnew.cpp
index 7268395a03..549c613cc5 100644
--- a/gerbview/export_to_pcbnew.cpp
+++ b/gerbview/export_to_pcbnew.cpp
@@ -325,6 +325,9 @@ void GBR_TO_PCB_EXPORTER::export_via( const EXPORT_VIA& aVia )
 
 void GBR_TO_PCB_EXPORTER::export_copper_item( const GERBER_DRAW_ITEM* aGbrItem, int aLayer )
 {
+    if( aGbrItem->GetLayerPolarity() )
+        return;
+
     switch( aGbrItem->m_ShapeType )
     {
     case GBR_SPOT_CIRCLE: