From 8a0384e2f6db846029c47e11faff3fb07adffa16 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Thu, 15 Sep 2022 17:52:57 +0200
Subject: [PATCH] crossprobing pcb->schematic: handle correctly empty sheets.
 (filtering selection candidates was not made for empty sheets) Fixes #12427
 https://gitlab.com/kicad/code/kicad/issues/12427

---
 eeschema/cross-probing.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/eeschema/cross-probing.cpp b/eeschema/cross-probing.cpp
index 531c56cd63..c24f3b0c34 100644
--- a/eeschema/cross-probing.cpp
+++ b/eeschema/cross-probing.cpp
@@ -553,6 +553,12 @@ bool sheetContainsOnlyWantedItems(
     SCH_REFERENCE_LIST references;
     aSheetPath.GetSymbols( references, false, true );
 
+    if( references.GetCount() == 0 )    // Empty sheet, obviously do not contain wanted items
+    {
+        aCache.emplace( aSheetPath, false );
+        return false;
+    }
+
     for( unsigned ii = 0; ii < references.GetCount(); ii++ )
     {
         SCH_REFERENCE& schRef = references[ii];