This will cause a horizontal scrollbar when the object inspector is minimized. Can you set this border only when the object inspector is expanded?

After this [line](https://github.com/tildeio/ember-extension/blob/master/css/app.css#L85), add:
```css
.app_inspector_expanded .app__inspector-container {
  border-left: 1px solid #bdbdbd;
}
```