From 33d16a1e28c20e1843dd3a8eedb662679e67391c Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Sat, 13 May 2023 15:34:11 +0200
Subject: [PATCH] Implemented fix for issue #1324

---
 src/layui/layui/layLayerControlPanel.cc | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/layui/layui/layLayerControlPanel.cc b/src/layui/layui/layLayerControlPanel.cc
index 31b3bacf2..8f9eb165c 100644
--- a/src/layui/layui/layLayerControlPanel.cc
+++ b/src/layui/layui/layLayerControlPanel.cc
@@ -1752,8 +1752,21 @@ set_hidden_flags_rec (LayerTreeModel *model, QTreeView *tree_view, const QModelI
       }
 
     } else {
-      tree_view->setRowHidden (r, parent, false);
+
       set_hidden_flags_rec (model, tree_view, index);
+
+      //  hide a group entry if all children are hidden
+
+      bool hide = true;
+      int rrows = model->rowCount (index);
+      for (int rr = 0; rr < rrows; ++rr) {
+        if (! tree_view->isRowHidden (rr, index)) {
+          hide = false;
+        }
+      }
+
+      tree_view->setRowHidden (r, parent, hide);
+
     }
 
   }