Merge pull request #2507 from srcejon/fix_2506

Set csv as default filename extension for save file dialogs.

plugins/channelrx/heatmap/heatmapgui.cpp

@@ -305,6 +305,7 @@ void HeatMapGUI::on_writeCSV_clicked()
 {
     m_csvFileDialog.setAcceptMode(QFileDialog::AcceptSave);
     m_csvFileDialog.setNameFilter("*.csv");
+    m_csvFileDialog.setDefaultSuffix("csv");
     if (m_csvFileDialog.exec())
     {
         QStringList fileNames = m_csvFileDialog.selectedFiles();