Replacing WordPress's comment code to move the comment reply form.

plugin-comment-reply.js

// After WP Core's comment-reply.js is loaded.

(function () {
  if ( typeof addComment === 'undefined' ) {
    return;
  }
  
  // Source: Jetpack comments module by Automattic.
  // See https://github.com/Automattic/jetpack/blob/2e9efb22810cbd0e60ad2d2a9158e47a4432577c/modules/comments/comments.php#L375-L413
  addComment._myPlugins_moveForm = addComment.moveForm;
  
  addComment.moveForm = function(  commId, parentId, respondId, postId ) {
    // Disable editor.
    addComment._myPlugins_moveForm(  commId, parentId, respondId, postId );
    // Re-initialize error.
  };
}());