title: Navigation from one MaterialApp to the route on second MaterialApp
body: <p>So this is the case, I have two MaterialApps in a Stack widget, I made it like that so they have separate navigation routes. The problem is, I need to navigate to a page which is on MaterialApp 1 from MaterialApp2.</p>
  <p>Even clearer example: Button is on MaterialApp 2, I need to press that button and page on MaterialApp 1 shows up. How do I do this? Whenever I use Navigator.of(context).push() on MaterialApp 2, it of course changes the page on that MaterialApp...</p>