Attempt 3

Author: cochcoder

src/slic3r/GUI/GUI_App.cpp

@@ -2559,6 +2559,11 @@ bool GUI_App::on_init_inner()
     //sidebar().aux_list()->init_auxiliary();
     mainframe->m_project->init_auxiliary();
 
+
+#ifdef __WXGTK3__
+    gtk_window_set_titlebar(GTK_WINDOW(mainframe), GTK_WIDGET(mainframe->topbar()));
+#endif
+
 //     update_mode(); // !!! do that later
     SetTopWindow(mainframe);
 
@@ -3372,17 +3377,6 @@ void GUI_App::recreate_GUI(const wxString &msg_name)
     //sidebar().aux_list()->init_auxiliary();
     //mainframe->m_auxiliary->init_auxiliary();
 
-#ifdef __WXGTK3__
-    GtkWidget* gtk_topbar = static_cast<GtkWidget*>(mainframe->topbar()->GetHandle());
-    if (gtk_topbar) {
-        gtk_window_set_titlebar(GTK_WINDOW(mainframe->GetHandle()), gtk_topbar);
-    }
-#endif
-
-//#ifdef __WXGTK3__
-//    gtk_window_set_titlebar(GTK_WINDOW(mainframe), GTK_WIDGET(mainframe->topbar()));
-//#endif
-
     SetTopWindow(mainframe);
 
     dlg.Update(30, _L("Rebuild") + dots);