message: demo: finish dragging zone when drag starts.
diff: @@ -1538,7 +1538,10 @@ export default class ZonesExample extends React.Component<{}, State> {
  isActive={widget.tabIndex === 1}
  onClick={() => this._handleWidgetTabClick(widget.id, 1)}
  lastPosition={lastPosition}
  - onDragStart={(initialPosition, offset) => this._handleWidgetTabDragStart(widget.id, 1, initialPosition, offset)}
  + onDragStart={(initialPosition, offset) => {
  + this._handleWidgetTabDragStart(widget.id, 1, initialPosition, offset);
  + this._handleWidgetTabDragFinish();
  + }}
  onDragFinish={this._handleWidgetTabDragFinish}
  onDrag={this._handleWidgetTabDrag}
  anchor={anchor}
  