[FIX] #158830 【控制面板】【快捷键】添加自定义快捷键，点击程序按钮弹出文件浏览窗口后控制面板卡死（每次第一次点击必现，之后高概率复现）

libpeony-qt/thumbnail-manager.cpp

@@ -437,7 +437,7 @@ void ThumbnailManager::updateDesktopFileThumbnail(const QString &uri, std::share
         //async
         //qDebug()<<"desktop file"<<uri;
         auto thumbnailJob = new ThumbnailJob(uri, watcher, this);
-        QThreadPool::globalInstance()->start(thumbnailJob, QThread::Priority::HighestPriority);
+        m_thumbnail_thread_pool->start(thumbnailJob, QThread::Priority::HighestPriority);
     } else {
         releaseThumbnail(uri);
         if (watcher) {