message: fix combo box selection UI bug
diff: @@ -204,9 +204,10 @@ namespace ospray {
  list.push_back('\0');
  }
  - ImGui::Combo(text.c_str(), &val, list.c_str(), whitelist.size());
  - AsyncRenderEngine::g_instance->scheduleNodeValueChange(*node,
  - whitelist[val]);
  + if (ImGui::Combo(text.c_str(), &val, list.c_str())) {
  + AsyncRenderEngine::g_instance->scheduleNodeValueChange(
  + *node, whitelist[val]);
  + }
  } else {
  std::vector<char> buf(value.size() + 1 + 256);
  strcpy(buf.data(), value.c_str());
  