Update mattermost-redux to master (#6982)

webapp/components/file_attachment_list/index.js

@@ -11,7 +11,8 @@ import FileAttachmentList from './file_attachment_list.jsx';
 function makeMapStateToProps() {
     const selectFilesForPost = makeGetFilesForPost();
     return function mapStateToProps(state, ownProps) {
-        const fileInfos = selectFilesForPost(state, ownProps.post);
+        const postId = ownProps.post ? ownProps.post.id : '';
+        const fileInfos = selectFilesForPost(state, postId);
 
         let fileCount = 0;
         if (ownProps.post.file_ids) {

webapp/components/post_view/commented_on_files_message/commented_on_files_message.jsx

@@ -45,7 +45,7 @@ export default class CommentedOnFilesMessage extends React.PureComponent {
                     id='post_body.plusMore'
                     defaultMessage=' plus {count, number} other {count, plural, one {file} other {files}}'
                     values={{
-                        count: this.props.fileInfos.length
+                        count: this.props.fileInfos.length - 1
                     }}
                 />
             );

webapp/components/post_view/commented_on_files_message/index.js

@@ -15,7 +15,7 @@ function makeMapStateToProps() {
     return function mapStateToProps(state, ownProps) {
         let fileInfos;
         if (ownProps.parentPostId) {
-            fileInfos = selectFileInfosForPost(state, {id: ownProps.parentPostId});
+            fileInfos = selectFileInfosForPost(state, ownProps.parentPostId);
         }
 
         return {