message: replace filename widget checkbox with button
diff: @@ -548,16 +548,6 @@ inline bool generateWidget_filename(const std::string &title, Node &node)
  return false;
  }
  - bool remove = (f != "");
  - if (remove) {
  - if (ImGui::Checkbox("##remove", &remove)) {
  - node.setValue(std::string(""));
  - return true;
  - }
  - showTooltip("remove value");
  - ImGui::SameLine();
  - }
  -
  static bool showFileBrowser = false;
  // This field won't be typed into.
  ImGui::InputTextWithHint(
  @@ -565,6 +555,14 @@ inline bool generateWidget_filename(const std::string &title, Node &node)
  if (ImGui::IsItemClicked())
  showFileBrowser = true;
  + if (f != "") {
  + ImGui::SameLine();
  + if (ImGui::Button("remove##texfile")) {
  + node.setValue(std::string(""));
  + return true;
  + }
  + }
  +
  // Leave the fileBrowser open until file is selected
  if (showFileBrowser) {
  ospray_studio::FileList fileList = {};
  