title: How to get a reference to component at specific x,y coordinates on screen
body: <p>I need to get a list of components (x, y) at specified coordinates, preferably in order from children to grandparents. Would be awesome if absolutely positioned components were taken into account.</p>
  
  <p>Think: which components (and in what order) <strong>would</strong> have the opportunity to react to a click/touch event at (x, y).</p>
  
  <p>I am currently trying to build a mechanism that would keep track of every component that exists, and what are it's relations to other components (which one is parent, which one is children, so I can sort them). It's ugly, lots of edgecases, components that I wish were trackable need to know about it and cooperate, and I think I'm just reimplementing something that's already there.</p>
  
  <p>EDIT: This is (probably) not about measuring. It's about asking "what components are currently rendered under pixel (123,456)"</p>