message: Hide trailing separator in PR and commit files dropdown
diff: #all_commit_comments .timeline-comment-wrapper {
  max-width: 780px; /* This is the limit applied on the comment thread by `.comment-holder` */
  }
  +
  +/* Hide trailing separator in PR/commit file diff dropdown */
  +.js-file-header-dropdown .dropdown-menu > .dropdown-divider:last-child {
  + display: none !important;
  +}
  