code: private boolean hasStage (InputProcessor processor) {
  		if (!(processor instanceof InputMultiplexer)) {
  			return processor == stage;
  		}
  		InputMultiplexer im = (InputMultiplexer)processor;
  		SnapshotArray<InputProcessor> ips = im.getProcessors();
  		for (InputProcessor ip : ips) {
  			if (hasStage(ip)) {
  				return true;
  			}
  		}
  		return false;
  	}
docs: Compares the given processor to the console's stage. If given a multiplexer, it is iterated through recursively to check all
  of the multiplexer's processors for comparison.
  
  @param processor
  @return processor == this.stage