title: Autodesk Forge Viewer : Snapper won't snap on selected objects
body: <p>I have a strange issue with forge snapper.</p>
  <p>If some objects are selected (hilited in light blue), then the Snapper seems to ignore them completly.</p>
  <p>That is, hovering the mouse on them does not give any visual effect.</p>
  <p>Clicking on them, Snapper will give &quot;-1&quot; for nodeID.</p>
  <p><a href="https://i.stack.imgur.com/GOSHT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GOSHT.png" alt="enter image description here" /></a></p>
  <p>Unselecting those objects make the snapper working again on the same objects.</p>
  <p>The snapper is initialized like so :</p>
  <pre><code>this._snapper = new Autodesk.Viewing.Extensions.Snapping.Snapper(this.viewer, {
      renderSnappedGeometry: true,
      renderSnappedTopology: false,
      markupMode: false,
      toolName: SnapperName, // Setting a custom name for &quot;our&quot; snapper, to avoid being mixed up with viewer created snapper before or after it with the same name 
  });
  </code></pre>
  <p>Anyone could give some help ?</p>
  <p>Thanks</p>
  <hr />
  <p>Edit : I have @types/forge-viewer 7.69.1</p>
  <p>Here is the callstack :</p>
  <p><a href="https://i.stack.imgur.com/W10Yi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/W10Yi.png" alt="enter image description here" /></a></p>