Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Common/TopicEditorBase/topic_preview_widget.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include "topic_editor_utils.h"
+
+#include <TopicEditorBase/topiceditorbase_export.h>
+
+#include <QWidget>
+
+
+namespace Ui { class TopicPreviewWidget; }
+
+
+namespace TopicEditorBase
+{
+
+class TopicPreviewer;
+
+
+class TOPICEDITORBASE_EXPORT TopicPreviewWidget : public QWidget
+{
+  Q_OBJECT
+
+public:
+  explicit TopicPreviewWidget(QWidget *parent = nullptr);
+  ~TopicPreviewWidget();
+
+  void setTopicData(const TopicData &data);
+  void setTopicEnabled(bool enabled);
+
+  QString description() const;
+  void setDescription(const QString &description);
+
+  TopicPreviewer *previewer();
+
+private:
+  void contextMenuEvent(QContextMenuEvent *event);
+
+signals:
+  void startDragMe();
+  void stopDragMe();
+  void deleteMe();
+
+private:
+  Ui::TopicPreviewWidget *m_ui{nullptr};
+
+};
+
+}