MM-15035: Read from file infos from master on post creation (#10899)

* MM-15035: Read from file infos from master on post creation

* Handling edit post cases for get files metadata

app/post_metadata.go

@@ -45,7 +45,7 @@ func (a *App) PreparePostListForClient(originalList *model.PostList) *model.Post
 	}
 
 	for id, originalPost := range originalList.Posts {
-		post := a.PreparePostForClient(originalPost, false)
+		post := a.PreparePostForClient(originalPost, false, false)
 
 		list.Posts[id] = post
 	}
@@ -53,7 +53,7 @@ func (a *App) PreparePostListForClient(originalList *model.PostList) *model.Post
 	return list
 }
 
-func (a *App) PreparePostForClient(originalPost *model.Post, isNewPost bool) *model.Post {
+func (a *App) PreparePostForClient(originalPost *model.Post, isNewPost bool, isEditPost bool) *model.Post {
 	post := originalPost.Clone()
 
 	// Proxy image links before constructing metadata so that requests go through the proxy
@@ -74,7 +74,7 @@ func (a *App) PreparePostForClient(originalPost *model.Post, isNewPost bool) *mo
 	}
 
 	// Files
-	if fileInfos, err := a.getFileMetadataForPost(post); err != nil {
+	if fileInfos, err := a.getFileMetadataForPost(post, isNewPost || isEditPost); err != nil {
 		mlog.Warn("Failed to get files for a post", mlog.String("post_id", post.Id), mlog.Err(err))
 	} else {
 		post.Metadata.Files = fileInfos
@@ -96,12 +96,12 @@ func (a *App) PreparePostForClient(originalPost *model.Post, isNewPost bool) *mo
 	return post
 }
 
-func (a *App) getFileMetadataForPost(post *model.Post) ([]*model.FileInfo, *model.AppError) {
+func (a *App) getFileMetadataForPost(post *model.Post, fromMaster bool) ([]*model.FileInfo, *model.AppError) {
 	if len(post.FileIds) == 0 {
 		return nil, nil
 	}
 
-	return a.GetFileInfosForPost(post.Id)
+	return a.GetFileInfosForPost(post.Id, fromMaster)
 }
 
 func (a *App) getEmojisAndReactionsForPost(post *model.Post) ([]*model.Emoji, []*model.Reaction, *model.AppError) {