message: add key to media item to prevent wrong image showing up when swapping content viewer
diff: import Vue, { CreateElement } from 'vue';
  import { Component, Prop } from 'vue-property-decorator';
  +import AppContentMediaItem from '../../components/media-item/media-item.vue';
  import { ContentObject } from '../../content-object';
  import { ContentOwner } from '../../content-owner';
  -import AppContentMediaItem from '../../components/media-item/media-item.vue';
  @Component({})
  export class AppContentViewerMediaItem extends Vue {
  @@ -13,6 +13,7 @@ export class AppContentViewerMediaItem extends Vue {
  render(h: CreateElement) {
  return h(AppContentMediaItem, {
  + key: this.data.attrs.id.toString(),
  props: {
  mediaItemId: this.data.attrs.id,
  mediaItemWidth: this.data.attrs.width,
  