QFileSystemWatcher只触发一次

百度AI回答：

只能触发一次，如果需要持续触发，需要在处理完触发后，再次添加路径。

const QString filepath_bookmark = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation) + "/gtk-3.0/bookmarks";
QFileSystemWatcher *watcher = new QFileSystemWatcher;
watcher->addPath(filepath_bookmark);
connect(watcher, &QFileSystemWatcher::fileChanged, [=]{
    genBookmark();
    watcher->addPath(filepath_bookmark);
});