Prevent labors from being set on visitors

[adiamaq]

So to explain this issue, there seems to be a bug in the game, where if you have visitors , let's say, 20, and you have a total of 30 population, in the Labor tab there will only show 10 of them (the original dwarves). However, if you go to any of those visitors and click on their own labour tab, you can assign works there. Yeah, 2 years later, those visitors will ask for citizenship, but meanwhile you're unable to see them in main labor matrix. Would it be possible to display everyone in the main Labor tab? Or maybe force the conversion of those visitors