title: Flickering ListView in virtual mode
body: <p>I found a not so funny bug in the default ListView (not owner drawed!). It flickers <strong>heavily</strong> when items are added constantly into it (by using <code>Timer</code> to example) and user is trying to see items slightly <strong>away from selected item</strong> (scrolled either up or down).</p>
  
  <h2>Am I doing something wrong here?</h2>
  
  <p>Here is some code to reproduce it:</p>
  
  <ul>
  <li>Create WindowsFormsApplication1;</li>
  <li>set form <code>WindowState</code> to Maximized;</li>
  <li>put on form timer1, set <code>Enabled</code> to true;</li>
  <li><p>put on form listView1:</p>
  
  <pre><code>    this.listView1.Dock = System.Windows.Forms.DockStyle.Fill;
      this.listView1.View = System.Windows.Forms.View.Details;
      this.listView1.VirtualMode = true;
  </code></pre></li>
  <li><p>add one column;</p></li>
  <li><p>add event</p>
  
  <pre><code>    this.listView1.RetrieveVirtualItem += new System.Windows.Forms.RetrieveVirtualItemEventHandler(this.listView1_RetrieveVirtualItem);
  </code></pre></li>
  <li><p>and finally</p>
  
  <pre><code>private void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
  {
      e.Item = new ListViewItem(e.ItemIndex.ToString());
  }
  
  private void timer1_Tick(object sender, EventArgs e)
  {
      listView1.VirtualListSize++;
  }
  </code></pre></li>
  </ul>
  
  <hr>
  
  <p>Now run it and wait until scrollbar on listview will appears (as timer will add enough items), then:</p>
  
  <ul>
  <li><p>Select one of the first items in the listview (with mouse or keys), then scroll <strong>down</strong> by using scrollbar or mouse wheel, so that selected item will go outside of current view (up). The more you scroll down, the heavier flickering will become! And look at what scrollbar is doing ?!?!?</p></li>
  <li><p>Similar effect appears if scrolling selected item down.</p></li>
  </ul>
  
  <hr>
  
  <h2>Question</h2>
  
  <p>How do I deal with it? Idea is to have sort of constantly updating log window with possibility to stop auto-scrolling and go up/down to investigate events in close proximity. But with that <em>kek-effect</em> it is just not possible!</p>