message: To aid debugging, set indicators in title bar for nav mode, frame modified/canceled
diff: @@ -827,6 +827,13 @@ void MainWindow::updateTitleBar()
  std::stringstream windowTitle;
  windowTitle << "OSPRay Studio: ";
  + // Set indicators in the title bar for nav mode, frame modified and canceled
  + windowTitle << " <";
  + windowTitle << (navMode ? "n" : "_");
  + windowTitle << (frame->isModified() ? "m" : "_");
  + windowTitle << (frame->isCanceled() ? "c" : "_");
  + windowTitle << "> ";
  +
  if (frame->pauseRendering) {
  windowTitle << "rendering paused";
  } else if (frame->accumLimitReached()) {
  