[PLT-1249] Add close button 'x' to the right of a link preview (#7017)

* add close button 'x' to the right of a link preview

* Updating webhook UI

* UI improvements for close button

* Adding hover state

* Making the close button visible on mobile

* previews are permanently disabled/closed for that link

* make post as required props

* fix JS error of undefined

* fix update issue both at center and RHS view

1 files changed, 3 insertions, 1 deletions

diff --git a/webapp/components/post_view/post_attachment_opengraph/index.js b/webapp/components/post_view/post_attachment_opengraph/index.js
index e0bec8f36..1f889f1d6 100644
--- a/webapp/components/post_view/post_attachment_opengraph/index.js
+++ b/webapp/components/post_view/post_attachment_opengraph/index.js
@@ -2,6 +2,7 @@
 // See License.txt for license information.
 
 import {connect} from 'react-redux';
+import {getCurrentUser} from 'mattermost-redux/selectors/entities/users';
 import {bindActionCreators} from 'redux';
 import {getOpenGraphMetadata} from 'mattermost-redux/actions/posts';
 import {getOpenGraphMetadataForUrl} from 'mattermost-redux/selectors/entities/posts';
@@ -11,7 +12,8 @@ import PostAttachmentOpenGraph from './post_attachment_opengraph.jsx';
 function mapStateToProps(state, ownProps) {
     return {
         ...ownProps,
-        openGraphData: getOpenGraphMetadataForUrl(state, ownProps.link)
+        openGraphData: getOpenGraphMetadataForUrl(state, ownProps.link),
+        currentUser: getCurrentUser(state),
     };
 }