From 94cb00392e570e9a9657ade2b1516ee5442a5497 Mon Sep 17 00:00:00 2001
From: Jeff Young <jeff@rokeby.ie>
Date: Tue, 30 Jan 2024 14:14:00 +0000
Subject: [PATCH] Repair connectivity if bus aliases changed.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/16503
---
 eeschema/eeschema_config.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/eeschema/eeschema_config.cpp b/eeschema/eeschema_config.cpp
index ecdcea32dc..6bd7538722 100644
--- a/eeschema/eeschema_config.cpp
+++ b/eeschema/eeschema_config.cpp
@@ -79,6 +79,15 @@ bool SCH_EDIT_FRAME::LoadProjectSettings()
 
 void SCH_EDIT_FRAME::ShowSchematicSetupDialog( const wxString& aInitialPage )
 {
+    SCH_SCREENS screens( Schematic().Root() );
+    std::vector<std::shared_ptr<BUS_ALIAS>> oldAliases;
+
+    for( SCH_SCREEN* screen = screens.GetFirst(); screen != nullptr; screen = screens.GetNext() )
+    {
+        for( const std::shared_ptr<BUS_ALIAS>& alias : screen->GetBusAliases() )
+            oldAliases.push_back( alias );
+    }
+
     DIALOG_SCHEMATIC_SETUP dlg( this );
 
     if( !aInitialPage.IsEmpty() )
@@ -104,6 +113,18 @@ void SCH_EDIT_FRAME::ShowSchematicSetupDialog( const wxString& aInitialPage )
 
         GetCanvas()->GetView()->MarkDirty();
         GetCanvas()->GetView()->UpdateAllItems( KIGFX::REPAINT );
+
+        std::vector<std::shared_ptr<BUS_ALIAS>> newAliases;
+
+        for( SCH_SCREEN* screen = screens.GetFirst(); screen != nullptr; screen = screens.GetNext() )
+        {
+            for( const std::shared_ptr<BUS_ALIAS>& alias : screen->GetBusAliases() )
+                newAliases.push_back( alias );
+        }
+
+        if( oldAliases != newAliases )
+            RecalculateConnections( nullptr, GLOBAL_CLEANUP );
+
         RefreshOperatingPointDisplay();
         GetCanvas()->Refresh();
     }