Improve code style

sources/richtext/richtexteditor_p.h

@@ -70,7 +70,7 @@ class RichTextEditor;
 class RichTextEditorDialog : public QDialog
 {
 	Q_OBJECT
-public:
+	public:
 		explicit RichTextEditorDialog(QWidget *parent = nullptr);
 		~RichTextEditorDialog() override;
 
@@ -79,23 +79,23 @@ public:
 		void setText(const QString &text);
 		QString text(Qt::TextFormat format = Qt::AutoText) const;
 
-signals:
+	signals:
 		void applyEditText(const QString &);
 
-private slots:
+	private slots:
 		void tabIndexChanged(int newIndex);
 		void richTextChanged();
 		void sourceChanged();
 		void on_buttonBox_accepted();
 
-private:
+	private:
 		enum TabIndex { RichTextIndex, SourceIndex };
 		enum State { Clean, RichTextChanged, SourceChanged };
 		RichTextEditor *m_editor;
 		QTextEdit      *m_text_edit;
 		QTabWidget     *m_tab_widget;
 		State m_state;
-    };
+};
 
 } // namespace qdesigner_internal