Merge pull request #2551 from pnvttk/fix-play-all-button

Fixed duplicated play all button when switch page

js&css/web-accessible/www.youtube.com/channel.js

@@ -27,14 +27,16 @@ ImprovedTube.channelPlayAllButton = function () {
  if (ImprovedTube.regex.channel.test(location.pathname)) {
  if (this.storage.channel_play_all_button) {
  const container = document.querySelector('ytd-channel-sub-menu-renderer #primary-items')
- || document.querySelector('ytd-two-column-browse-results-renderer #chips-content'),
- playlistUrl = document.querySelector('ytd-app')?.__data?.data?.response?.metadata?.channelMetadataRenderer?.externalId?.substring(2);
+ || document.querySelector('ytd-two-column-browse-results-renderer #chips-content');
+ const playlistUrl = document.querySelector('ytd-app')?.__data?.data?.response?.metadata?.channelMetadataRenderer?.externalId?.substring(2);
+ const existingPlayAllButton = document.querySelector('.it-play-all-button')
 
  if (!container) return; // we only add button on /videos page
  if (!playlistUrl) {
  console.error('channelPlayAllButton: Cant fint Channel playlist');
  return;
  }
+ if (existingPlayAllButton) return // prevent add duplicate button
  const button = this.createIconButton({
  type: 'playAll',
  className: 'it-play-all-button',