title: Realm + Xamarin Forms Update Query
body: <p>I'm using Realm + Xamarin Forms to do what I figure is about the most basic operation possible: a list view shows a collection of items, with a search bar filtering the results as the user types.</p>
  
  <p>I have a get only collection property used as the list view's items source, initially populated from a Realm query, and this gets updated automatically with any changes to data, but I can't figure out how to update the search text without adding a set and literally replacing the entire collection. </p>
  
  <p>This is very inefficient--I assume this is triggering re-registration of a bunch of notify-changed event listeners for the collection and each item in it and generally causing mass chaos with each letter tapped.</p>
  
  <p>In the past I've created my own wrapping observable collection with a search method to handle this and I suppose that is an option here as well, but is there any way to do this with Realm? That is, to update the query without recreating the entire collection, some way to re-run the original query?</p>