viewerCO->blockSignals(true);
viewerCO->clear();
viewerCO->addItem(qt_("None"), QString());
+ viewerCO->addItem(qt_("System Default"), QString("auto"));
updateComboBox(viewer_alternatives, f.name(), viewerCO);
viewerCO->addItem(qt_("Custom"), QString("custom viewer"));
viewerCO->blockSignals(false);
editorCO->blockSignals(true);
editorCO->clear();
editorCO->addItem(qt_("None"), QString());
+ editorCO->addItem(qt_("System Default"), QString("auto"));
updateComboBox(editor_alternatives, f.name(), editorCO);
editorCO->addItem(qt_("Custom"), QString("custom editor"));
editorCO->blockSignals(false);