Fix Home, End, Page Up and Page Down keys for Superpower ChatGPT and OpenAI broken chats

For some Superpower ChatGPT and OpenAI chats the Home, End, Page Up and Page Down keys stop working, this script fixes the problem

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// ==UserScript==
// @name         Fix Home, End, Page Up and Page Down keys for Superpower ChatGPT and OpenAI broken chats
// @description  For some Superpower ChatGPT and OpenAI chats the Home, End, Page Up and Page Down keys stop working, this script fixes the problem
// @author       NWP
// @namespace    https://gf.qytechs.cn/users/877912
// @version      0.6
// @license      MIT
// @match        https://chat.openai.com/*
// @match        https://chatgpt.com/*
// @grant        none
// ==/UserScript==

(function () {
  'use strict';
  
  document.addEventListener('keydown', function (event) {
    if (['INPUT', 'TEXTAREA'].includes(document.activeElement.tagName)) {
      return;
    }

    const scrollableContainer = Array.from(document.querySelectorAll('div')).find(div => /^react-scroll-to-bottom--css-\S+$/.test(div.className)) || // OpenAI
                                document.querySelector('#conversation-inner-div'); // Superpower ChatGPT

    if (!scrollableContainer) {
      console.error("No scrollable container found.");
      return;
    }

    switch (event.key) {
      case 'Home':
      case 'End':
        scrollToEnds(event, scrollableContainer);
        break;
      case 'PageUp':
      case 'PageDown':
        scrollByPage(event, scrollableContainer);
        break;
    }
  });

  function scrollToEnds(event, container) {
    event.preventDefault();
    const position = event.key === 'Home' ? 0 : container.scrollHeight;
    container.scrollTo({ top: position, behavior: 'instant' });
  }

  function scrollByPage(event, container) {
    event.preventDefault();
    const amount = event.key === 'PageUp' ? -container.clientHeight * 0.75 : container.clientHeight * 0.75;
    container.scrollBy({ top: amount, behavior: 'instant' });
  }
})();

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