Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Plugins/PlanEditor/model_tree_widget.h

@@ -0,0 +1,55 @@
+
+
+
+#pragma once
+
+
+#include "model_tree_widget_item.h"
+
+#include "dialog.h"
+
+
+class QGroupBox;
+
+namespace PlanEditor
+{
+
+class PlanEditor;
+
+class ModelTreeWidget : public Dialog
+{
+  Q_OBJECT
+
+public:
+  using BaseClass = Dialog;
+
+  ModelTreeWidget(PlanEditor *planEditor, QWidget *parent);
+  ~ModelTreeWidget() = default;
+
+  QTreeWidgetItem   *rootItem() const { return m_itemTreeRoot; }
+
+  void showNeedSaveFlag(bool);
+
+  void setNameOfPlan( const QString & nameOfPlan );
+
+  bool isEmpty() const;
+
+  void haveChanges(bool on);
+
+private:
+  void keyPressEvent(QKeyEvent *event);
+
+  void buildTitle();
+
+  QPointer<PlanEditor>  m_planEditor;
+  QGroupBox             *m_treeGroup;
+  QTreeWidget           *m_treeWidget;
+  QTreeWidgetItem       *m_itemTreeRoot;
+  QString                m_nameOfPlan;
+  QString                m_title;
+  bool                   m_needSaveFlag;
+
+}; 
+
+
+}