message: Fix mouseUp handling in cross-origin iframes.
  Don't call event.preventDefault() so we receive mouse events when
  dragging, even if mouse left our frame. *
  *
diff: @@ -802,7 +802,6 @@ export class MapControls extends THREE.EventDispatcher {
  return;
  }
  - event.preventDefault();
  event.stopPropagation();
  if (this.m_state !== State.NONE) {
  @@ -827,17 +826,12 @@ export class MapControls extends THREE.EventDispatcher {
  const onMouseMove = this.mouseMove.bind(this);
  const onMouseUp = this.mouseUp.bind(this);
  - // iframe handling for the examples.
  window.addEventListener("mousemove", onMouseMove, false);
  - window.top.addEventListener("mousemove", onMouseMove, false);
  window.addEventListener("mouseup", onMouseUp, false);
  - window.top.addEventListener("mouseup", onMouseUp, false);
  this.m_cleanupMouseEventListeners = () => {
  window.removeEventListener("mousemove", onMouseMove);
  - window.top.removeEventListener("mousemove", onMouseMove);
  window.removeEventListener("mouseup", onMouseUp);
  - window.top.removeEventListener("mouseup", onMouseUp);
  };
  }
  