From 622c2f1316f0662b513fedb4b2de20762bd78f5c Mon Sep 17 00:00:00 2001
From: Jon Evans <jon@craftyjon.com>
Date: Sun, 11 Feb 2024 20:01:05 -0500
Subject: [PATCH] Make sure connectivity is updated in undo/redo

Fixes https://gitlab.com/kicad/code/kicad/-/issues/16945
---
 pcbnew/undo_redo.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pcbnew/undo_redo.cpp b/pcbnew/undo_redo.cpp
index 9252acb903..0870d97a3d 100644
--- a/pcbnew/undo_redo.cpp
+++ b/pcbnew/undo_redo.cpp
@@ -485,7 +485,11 @@ void PCB_BASE_EDIT_FRAME::PutDataInPreviousState( PICKED_ITEMS_LIST* aList )
     if( IsType( FRAME_PCB_EDITOR ) )
     {
         if( reBuild_ratsnest || deep_reBuild_ratsnest )
+        {
+            // Connectivity may have changed; rebuild internal caches to remove stale items
+            GetBoard()->BuildConnectivity();
             Compile_Ratsnest( false );
+        }
 
         if( solder_mask_dirty )
             HideSolderMask();