From de6e1ffd538f2bb174e9eb2b75931f7ec9781d3b Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@koefferlein.de>
Date: Wed, 28 Dec 2022 17:15:51 +0100
Subject: [PATCH] Another performance fix for the many layers case

---
 src/layui/layui/layWidgets.cc | 8 +++++++-
 src/layui/layui/layWidgets.h  | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/layui/layui/layWidgets.cc b/src/layui/layui/layWidgets.cc
index 3d7c9100d..965ce8dd3 100644
--- a/src/layui/layui/layWidgets.cc
+++ b/src/layui/layui/layWidgets.cc
@@ -326,7 +326,7 @@ struct LayerSelectionComboBoxPrivateData
 };
 
 LayerSelectionComboBox::LayerSelectionComboBox (QWidget *parent)
-  : QComboBox (parent)
+  : QComboBox (parent), dm_update_layer_list (this, &LayerSelectionComboBox::do_update_layer_list)
 {
   mp_private = new LayerSelectionComboBoxPrivateData ();
   mp_private->no_layer_available = false;
@@ -471,6 +471,12 @@ LayerSelectionComboBox::set_layout (const db::Layout *layout)
 
 void
 LayerSelectionComboBox::update_layer_list ()
+{
+  dm_update_layer_list ();
+}
+
+void
+LayerSelectionComboBox::do_update_layer_list ()
 {
   int i = currentIndex ();
   db::LayerProperties props = mp_private->last_props;
diff --git a/src/layui/layui/layWidgets.h b/src/layui/layui/layWidgets.h
index 02d9666f4..10077217a 100644
--- a/src/layui/layui/layWidgets.h
+++ b/src/layui/layui/layWidgets.h
@@ -28,6 +28,7 @@
 #include "layuiCommon.h"
 
 #include "tlObject.h"
+#include "tlDeferredExecution.h"
 
 #include <QPushButton>
 #include <QComboBox>
@@ -251,9 +252,11 @@ protected slots:
 
 private:
   LayerSelectionComboBoxPrivateData *mp_private;
+  tl::DeferredMethod<LayerSelectionComboBox> dm_update_layer_list;
 
   void on_layer_list_changed (int);
   void update_layer_list ();
+  void do_update_layer_list ();
 };
 
 /**