Excessive flickering of lines when editing shapes in WorldWind

[jaybarra]

When editing points in WorldWind the lines that are drawn flicker a lot.

Use the following script and edit the shape by moving the control points

var counterattack = new emp3.api.MilStdSymbol({
  symbolCode: "GFTPKF--------X",
  positions: [
    {latitude: 20, longitude: 50}, // Tip of the arrow
    {latitude: 20, longitude: 49}, // Back of the arrow
    {latitude: 20.1, longitude: 49.8} // Shape of the arrow
  ]
});
this.props.addFeature(counterattack);

var overlay = new emp3.api.Overlay();
this.props.addOverlay(overlay);

map0.addOverlay({
  overlay: overlay,
  onSuccess: function() {
    overlay.addFeature({
      feature: counterattack,
      onSuccess: function() {
        map0.zoomTo({
          overlay: overlay
        });
        map0.editFeature({
          feature: counterattack
        });
      }
    });
  }
});

[alberto-acevedo]

Test case:

Use Worldwind. use branch 234

The fix reduces the flickering. test by comparing the flickering in the dev branch against this branch. the test is a success if the flickering in this branch is reduced.

[mubinakhan]

Still flickering while editing

[mubinakhan]

Reintegrate

[alberto-acevedo]

Already merged into the dev branch. Closing this issue.