Fixed layout.removeRow for old versions of Qt

logqso.cpp

@@ -124,9 +124,18 @@ void LogQSO::resetAdditionalFields(){
 
     auto layout = static_cast<QFormLayout*>(ui->additionalFields->layout());
     layout->removeItem(ui->field_button_layout);
+
+#if QT_VERSION >= 0x050800
     for(int i = 0, count = layout->rowCount(); i < count; i++){
         layout->removeRow(0);
     }
+#else
+    QLayoutItem *child;
+    while((child = layout->takeAt(0)) != 0){
+        delete child;
+    }
+#endif
+
     layout->addItem(ui->field_button_layout);
     m_additionalFieldsControls.clear();
 }