During a sale can't the company just dilute everyones stock and redivide the new stock amongst whoever is still at the company? That way anyone who is not prese

During a sale can't the company just dilute everyones stock and redivide the new stock amongst whoever is still at the company? That way anyone who is not present at sale time gets a very diluted stock. I think this is why if you leave the company and your vested you still get much less percentage of a company than you theoretically should have. I would think this is the norm?