message: Add tab key support in commit message field
diff: @@ -19,7 +19,7 @@ function blurAccessibly(field) {
  }
  function init() {
  - delegate('.js-comment-field', 'keydown', event => {
  + delegate('.js-comment-field, #commit-description-textarea', 'keydown', event => {
  const field: HTMLTextAreaElement = event.delegateTarget;
  // Don't do anything if the suggester box is active
  