@NotNull
  private static Collection<PropertiesFile> getPropertyFiles(@Nullable AntDomProject antDomProject, @NotNull XmlElement stopElement) {
    if (antDomProject == null) {
      return Collections.emptyList();
    }
    final Set<PropertiesFile> files = new HashSet<>();
    final int stopOffset = stopElement.getTextOffset();

    for (Iterator<AntDomElement> iterator = antDomProject.getAntChildrenIterator(); iterator.hasNext(); ) {
      AntDomElement child = iterator.next();
      final XmlElement xmlElement = child.getXmlElement();
      if (xmlElement != null && xmlElement.getTextOffset() >= stopOffset) {
        break; // no need to offer to add properties to files that are imported after the property reference
      }
      if (child instanceof AntDomProperty property) {
        final PropertiesFile file = property.getPropertiesFile();
        if (file != null) {
          files.add(file);
        }
      }
    }
    return files;
  }
@NotNull
  private static Collection<PropertiesFile> getPropertyFiles(@Nullable AntDomProject antDomProject, @NotNull XmlElement stopElement)