message: qt: Display warnings as rich text
diff: @@ -399,7 +399,7 @@ void BitcoinApplication::shutdownResult()
  void BitcoinApplication::handleRunawayException(const QString &message)
  {
  - QMessageBox::critical(nullptr, "Runaway exception", BitcoinGUI::tr("A fatal error occurred. %1 can no longer continue safely and will quit.").arg(PACKAGE_NAME) + QString("\n\n") + message);
  + QMessageBox::critical(nullptr, "Runaway exception", BitcoinGUI::tr("A fatal error occurred. %1 can no longer continue safely and will quit.").arg(PACKAGE_NAME) + QString("<br><br>") + message);
  ::exit(EXIT_FAILURE);
  }
  