@Nullable
  private Boolean suggestCreatingFileInstead(String subDirName) {
    Boolean createFile = false;
    if (StringUtil.countChars(subDirName, '.') == 1 && Registry.is("ide.suggest.file.when.creating.filename.like.directory")) {
      if (findFileTypeBoundToName(subDirName) != null) {
        String message = LangBundle.message("dialog.message.name.you.entered", subDirName);
        int ec = Messages.showYesNoCancelDialog(myProject, message,
                                                LangBundle.message("dialog.title.file.name.detected"),
                                                LangBundle.message("button.yes.create.file"),
                                                LangBundle.message("button.no.create", myIsDirectory ?
                                                                                       LangBundle.message("button.no.create.directory") :
                                                                                       LangBundle.message("button.no.create.package")),
                                                CommonBundle.getCancelButtonText(),
                                                Messages.getQuestionIcon());
        if (ec == Messages.CANCEL) {
          createFile = null;
        }
        if (ec == Messages.YES) {
          createFile = true;
        }
      }
    }
    return createFile;
  }
@Nullable
  private Boolean suggestCreatingFileInstead(String subDirName)