Update shared Qt playback controls after background decoding

tools/chatgui/src/messagelist.cpp

@@ -960,8 +960,7 @@ void MessageList::onAttachmentDownloaded(const QString& chId, int64_t msgId) {
         if (!fp.isEmpty() && QFile::exists(fp)) {
             QTimer::singleShot(500, this, [this, fp]() {
                 MessageDelegate::stopAllAutoPlay();
-                float actualDur = VoicePlayer::playOpusFile(fp);
-                MessageDelegate::startAutoPlay(fp, actualDur);
+                VoicePlayer::playOpusFile(fp, this, [fp](float actualDur) { MessageDelegate::startAutoPlay(fp, actualDur); });
             });
         }
     }