message: Don't zoom images when the cursor isn't over the image
diff: @@ -216,17 +216,13 @@ export default class ImageView extends React.Component<IProps, IState> {
  }
  private onWheel = (ev: WheelEvent) => {
  + if (ev.target === this.image.current) {
  ev.stopPropagation();
  ev.preventDefault();
  - const { deltaY } = normalizeWheelEvent(ev);
  - if (ev.target === this.image.current) {
  + const { deltaY } = normalizeWheelEvent(ev);
  // Zoom in on the point on the image targeted by the cursor
  this.zoomDelta(-deltaY * ZOOM_COEFFICIENT, ev.offsetX, ev.offsetY);
  - } else {
  - // The user is scrolling outside of the image, so we can't really
  - // get a targeted point. Instead, we'll just zoom in on the center.
  - this.zoomDelta(-deltaY * ZOOM_COEFFICIENT);
  }
  };
  