title: Flutter dragAnchorStrategy keep center on virtual point on screen
body: <p>I want the <code>feedback</code> icon to follow my cursor precisely everywhere on screen, but it's clear from this example that it doesn't:</p>
  <p><a href="https://i.stack.imgur.com/aiRss.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aiRss.gif" alt="enter image description here" /></a></p>
  <p>According to my research this is however the purpose role of <code>pointerDragAnchorStrategy</code>.
  This is my code:</p>
  <pre><code>import 'package:flutter/material.dart';
  
  class DragTest extends StatelessWidget {
    const DragTest({Key? key}) : super(key: key);
  
    @override
    Widget build(BuildContext context) {
      return Scaffold(
          body: SafeArea(
        child: Column(children: const &lt;Widget&gt;[
          Draggable(
            dragAnchorStrategy: pointerDragAnchorStrategy,
            feedback: Icon(Icons.circle),
            child: Text('DRAG ME'),
          ),
          SizedBox(height: 700),
          Draggable(
            dragAnchorStrategy: pointerDragAnchorStrategy,
            feedback: Icon(Icons.circle),
            child: Text('DRAG ME 2'),
          ),
        ]),
      ));
    }
  }
  </code></pre>
  <p>Even setting an offset manually, I have the exact same behavior:</p>
  <pre><code>dragAnchorStrategy:
      (Draggable&lt;Object&gt; _, BuildContext __, Offset ___) =&gt;
          const Offset(0, 0),
  </code></pre>