Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Common/LtsScriptTimeline/Test/mainwindow.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <QMainWindow>
+
+namespace Ui
+{
+class MainWindow;
+}
+
+namespace LtsScriptTimeline
+{
+class TrackEntry;
+}
+
+
+class MainWindow : public QMainWindow
+{
+  Q_OBJECT
+  
+public:
+  explicit MainWindow(QWidget *parent = 0);
+  ~MainWindow();
+
+private:
+  Ui::MainWindow *ui;
+  LtsScriptTimeline::TrackEntry *m_selectedTe;
+  QWidget *m_currentNewTopicEditor;
+  QWidget *m_currentEditTopicEditor;
+
+  void disconnectTrackEntry();
+
+private slots:
+  void slotTrackEntrySelectionChanged(LtsScriptTimeline::TrackEntry *te);
+};