Performance optimization for pull request files loading comments attachments (#33585)

routers/web/repo/pull.go

@@ -784,18 +784,18 @@ func viewPullFiles(ctx *context.Context, specifiedStartCommit, specifiedEndCommi
 		return
 	}
 
+	allComments := issues_model.CommentList{}
 	for _, file := range diff.Files {
 		for _, section := range file.Sections {
 			for _, line := range section.Lines {
-				for _, comment := range line.Comments {
-					if err := comment.LoadAttachments(ctx); err != nil {
-						ctx.ServerError("LoadAttachments", err)
-						return
-					}
-				}
+				allComments = append(allComments, line.Comments...)
 			}
 		}
 	}
+	if err := allComments.LoadAttachments(ctx); err != nil {
+		ctx.ServerError("LoadAttachments", err)
+		return
+	}
 
 	pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pull.BaseRepoID, pull.BaseBranch)
 	if err != nil {