From 7fb767653c7948cf8bdee789c5f9a171aa0db8eb Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Sun, 11 Oct 2020 17:06:28 +0100
Subject: [PATCH] Performance enhancements.

Don't redraw all pads when active layer is set unless it has
really changed.
---
 pcbnew/pcb_edit_frame.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pcbnew/pcb_edit_frame.cpp b/pcbnew/pcb_edit_frame.cpp
index a73aeb7bae..0785304daa 100644
--- a/pcbnew/pcb_edit_frame.cpp
+++ b/pcbnew/pcb_edit_frame.cpp
@@ -971,6 +971,9 @@ void PCB_EDIT_FRAME::SetGridColor( COLOR4D aColor )
 
 void PCB_EDIT_FRAME::SetActiveLayer( PCB_LAYER_ID aLayer )
 {
+    if( GetActiveLayer() == aLayer )
+        return;
+
     PCB_BASE_FRAME::SetActiveLayer( aLayer );
 
     m_appearancePanel->OnLayerChanged();