From e9b8cac3201d7325af1fa0d3ffd192f722586efe Mon Sep 17 00:00:00 2001
From: Jon Evans <jon@craftyjon.com>
Date: Mon, 24 Aug 2020 19:32:38 -0400
Subject: [PATCH] Erase net colors when they are reset by the user

Fixes https://gitlab.com/kicad/code/kicad/-/issues/5342
---
 pcbnew/widgets/appearance_controls.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pcbnew/widgets/appearance_controls.cpp b/pcbnew/widgets/appearance_controls.cpp
index d4fbda90e8..62c20b5f1c 100644
--- a/pcbnew/widgets/appearance_controls.cpp
+++ b/pcbnew/widgets/appearance_controls.cpp
@@ -264,7 +264,10 @@ void NET_GRID_TABLE::updateNetColor( const NET_GRID_ENTRY& aNet )
 
     std::map<int, KIGFX::COLOR4D>& netColors  = rs->GetNetColorMap();
 
-    netColors[aNet.code] = aNet.color;
+    if( aNet.color != COLOR4D::UNSPECIFIED )
+        netColors[aNet.code] = aNet.color;
+    else
+        netColors.erase( aNet.code );
 
     m_frame->GetCanvas()->GetView()->UpdateAllLayersColor();
     m_frame->GetCanvas()->RedrawRatsnest();