Don't allow menu bar when in fullscreen mode (because of changed background role)

src/pulsatingscience.cpp

@@ -225,7 +225,8 @@ void PulsatingScience::menuBarToggled()
 		on_actionMenu_bar_toggled(false);
 		ui.actionMenu_bar->setChecked(false);
 	}
-	else {
+	else if(!ui.actionFullscreen->isChecked()) {
+		// allow menu bar only when NOT in fullscreen mode
 		on_actionMenu_bar_toggled(true);
 		ui.actionMenu_bar->setChecked(true);
 	}