title: Angular CDK Drag & Drop: Don't move source item
body: <p>I am trying to implement an editor where one can drag an item to add it to the main content, the problem is that the source item is always destroyed when I'm dragging out of the source item container.</p>
  
  <p>Is there a way to force the source item to stay where it is while it's still possible to drag and drop the item? Basically, I want a copy-behaviour of that instead of a move-behaviour.</p>
  
  <p>I've already seen other questions that correspond to what I want to achieve basically, but none of them really helped me as the questions were more about how to get it technically done to copy an item while I want to know how I implement this behaviour in the UI as its very confusing to see if the item just disappears.</p>