fix /expand and /collapse for link previews (mattermost#6676)

* fix /expand and /collapse for link previews

* make props.openGraphData not required for PostAttachmentOpenGraph component

components/post_view/post_attachment_opengraph/post_attachment_opengraph.jsx

@@ -18,7 +18,7 @@ export default class PostAttachmentOpenGraph extends React.PureComponent {
  /**
  * The open graph data to render
  */
- openGraphData: PropTypes.object.isRequired,
+ openGraphData: PropTypes.object,
 
  /**
  * Set to collapse the preview
@@ -50,17 +50,16 @@ export default class PostAttachmentOpenGraph extends React.PureComponent {
  this.smallImageContainer = null;
  this.smallImageElement = null;
 
+ this.IMAGE_LOADED = {
+ LOADING: 'loading',
+ YES: 'yes',
+ ERROR: 'error'
+ };
+
  this.fetchData = this.fetchData.bind(this);
  this.toggleImageVisibility = this.toggleImageVisibility.bind(this);
  this.onImageLoad = this.onImageLoad.bind(this);
  this.onImageError = this.onImageError.bind(this);
- this.truncateText = this.truncateText.bind(this);
- }
-
- IMAGE_LOADED = {
- LOADING: 'loading',
- YES: 'yes',
- ERROR: 'error'
  }
 
  componentWillMount() {
@@ -76,6 +75,11 @@ export default class PostAttachmentOpenGraph extends React.PureComponent {
  if (nextProps.link !== this.props.link) {
  this.fetchData(nextProps.link);
  }
+ if (nextProps.previewCollapsed !== this.props.previewCollapsed) {
+ this.setState({
+ imageVisible: nextProps.previewCollapsed.startsWith('false')
+ });
+ }
  }
 
  fetchData(url) {