message: also trigger node search when pressing 'Enter' after typing node name
diff: @@ -388,16 +388,20 @@ namespace ospray {
  ImGui::Text("Search for node:");
  ImGui::SameLine();
  + auto doSearch = [&]() {
  + sg::GatherNodesByName visitor(nodeNameForSearch);
  + scenegraph->traverse(visitor);
  + collectedNodesFromSearch = visitor.results();
  + };
  +
  if (ImGui::InputText("", buf.data(),
  buf.size(), ImGuiInputTextFlags_EnterReturnsTrue)) {
  nodeNameForSearch = std::string(buf.data());
  + doSearch();
  }
  - if (ImGui::Button("Search")) {
  - sg::GatherNodesByName visitor(nodeNameForSearch);
  - scenegraph->traverse(visitor);
  - collectedNodesFromSearch = visitor.results();
  - }
  + if (ImGui::Button("Search"))
  + doSearch();
  ImGui::SameLine();
  if (nodeNameForSearch.empty()) {
  