From d2befca5af34d069760832a9d1c159a4f6bd487c Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Sun, 1 Nov 2020 12:13:53 +0000
Subject: [PATCH] Clear subshapes before using again on a different layer.

Fixes https://gitlab.com/kicad/code/kicad/issues/6248
---
 pcbnew/drc/drc_rtree.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pcbnew/drc/drc_rtree.h b/pcbnew/drc/drc_rtree.h
index 2365d90bed..2e8867dec1 100644
--- a/pcbnew/drc/drc_rtree.h
+++ b/pcbnew/drc/drc_rtree.h
@@ -92,6 +92,7 @@ public:
                 [&]( PCB_LAYER_ID layer )
                 {
                     std::shared_ptr<SHAPE> shape = aItem->GetEffectiveShape( layer );
+                    subshapes.clear();
 
                     if( shape->HasIndexableSubshapes() )
                         shape->GetIndexableSubshapes( subshapes );