Sort presets before display in the presets window

sdrbase/mainwindow.cpp

@@ -287,6 +287,7 @@ void MainWindow::loadSettings()
 	qDebug() << "MainWindow::loadSettings";
 
     m_settings.load();
+    m_settings.sortPresets();
 
     for(int i = 0; i < m_settings.getPresetCount(); ++i)
     {

sdrbase/settings/mainsettings.cpp

@@ -92,3 +92,8 @@ void MainSettings::deletePreset(const Preset* preset)
 	m_presets.removeAll((Preset*)preset);
 	delete (Preset*)preset;
 }
+
+void MainSettings::sortPresets()
+{
+    qSort(m_presets.begin(), m_presets.end(), Preset::presetCompare);
+}

sdrbase/settings/mainsettings.h

@@ -19,6 +19,7 @@ public:
 	void deletePreset(const Preset* preset);
 	int getPresetCount() const { return m_presets.count(); }
 	const Preset* getPreset(int index) const { return m_presets[index]; }
+	void sortPresets();
 
 	Preset* getWorkingPreset() { return &m_workingPreset; }
 	int getSourceIndex() const { return m_preferences.getSourceIndex(); }

sdrbase/settings/preset.h

@@ -75,6 +75,15 @@ public:
 			const QString& sourceSerial,
 			int sourceSequence) const;
 
+	static bool presetCompare(const Preset *p1, Preset *p2)
+	{
+	    if (p1->m_centerFrequency != p2->m_centerFrequency) {
+	        return p1->m_centerFrequency < p2->m_centerFrequency;
+	    } else {
+	        return p1->m_description < p2->m_description;
+	    }
+	}
+
 protected:
 	// group and preset description
 	QString m_group;