Channel Analyzer NG: handle rational downsampler in the GUI

plugins/channelrx/chanalyzerng/chanalyzernggui.cpp

@@ -190,10 +190,26 @@ void ChannelAnalyzerNGGUI::on_deltaMinus_toggled(bool minus)
 	}
 }
 
+void ChannelAnalyzerNGGUI::on_channelSampleRate_changed(quint64 value)
+{
+    if (ui->useRationalDownsampler->isChecked())
+    {
+        qDebug("ChannelAnalyzerNGGUI::on_channelSampleRate_changed: %llu", value);
+        setNewFinalRate(m_spanLog2);
+        applySettings();
+    }
+}
+
+void ChannelAnalyzerNGGUI::on_useRationalDownsampler_toggled(bool checked)
+{
+    setNewFinalRate(m_spanLog2);
+    applySettings();
+}
+
 int ChannelAnalyzerNGGUI::getRequestedChannelSampleRate()
 {
     if (ui->useRationalDownsampler->isChecked()) {
-        return ui->channelSampleRate->getValue();
+        return ui->channelSampleRate->getValueNew();
     } else {
         return m_channelizer->getInputSampleRate();
     }

plugins/channelrx/chanalyzerng/chanalyzernggui.h

@@ -61,6 +61,8 @@ private slots:
 	void channelizerInputSampleRateChanged();
 	void on_deltaFrequency_changed(quint64 value);
 	void on_deltaMinus_toggled(bool minus);
+    void on_channelSampleRate_changed(quint64 value);
+    void on_useRationalDownsampler_toggled(bool checked);
 	void on_BW_valueChanged(int value);
 	void on_lowCut_valueChanged(int value);
 	void on_spanLog2_currentIndexChanged(int index);

sdrbase/gui/valuedial.h

@@ -32,6 +32,7 @@ public:
 	void setBold(bool bold);
 	void setColorMapper(ColorMapper colorMapper);
 	quint64 getValue() const { return m_value; }
+	quint64 getValueNew() const { return m_valueNew; }
 
 signals:
 	void changed(quint64 value);