How can i get the START index when i drag and drop and item inside the same list

[andreadompe]

• I'm submitting a ...
  [ ] bug report
  [x ] feature request
  [ ] question about the decisions made in the repository

• Do you want to request a feature or report a bug?
  Feature

• What is the current behavior?
  I can't understand how get the start index when i drag an item,
  i'm only able to get the end index with onDropSuccess(item, endIndex)

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://plnkr.co or similar.

• What is the expected behavior?
  I would like to know how to get the start position of the dragged element.

• What is the motivation / use case for changing the behavior?

• Please tell us about your environment:

• Angular version: 2.X.X
• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)