The option to show status icons in full screen now calls config_save() on toggle, fixes #3815.

src/qt/qt_mainwindow.cpp

@@ -2033,5 +2033,6 @@ void MainWindow::on_actionShow_status_icons_in_fullscreen_triggered()
 {
     status_icons_fullscreen = !status_icons_fullscreen;
     ui->actionShow_status_icons_in_fullscreen->setChecked(status_icons_fullscreen);
+    config_save();
 }