More robust legend rendering in Well Log Plots

ApplicationCode/UserInterface/RiuQwtPlotLegend.h

@@ -24,8 +24,15 @@ class RiuQwtPlotLegend : public QwtLegend
     Q_OBJECT
 public:
     RiuQwtPlotLegend( QWidget* parent = nullptr );
-    void resizeEvent( QResizeEvent* event );
-    int  columnCount() const;
+    void  resizeEvent( QResizeEvent* event );
+    int   columnCount() const;
+    QSize sizeHint() const override;
+
+public slots:
+    void updateLegend( const QVariant&, const QList<QwtLegendData>& ) override;
+
+signals:
+    void legendUpdated();
 
 private:
     mutable int m_columnCount;