private boolean isShowInnerClasses() {
    boolean showInnerClasses = Registry.is("projectView.always.show.inner.classes", false);
    if (showInnerClasses) return true;
    VirtualFile file = getVirtualFile();
    return file != null && FileTypeRegistry.getInstance().isFileOfType(file, JavaClassFileType.INSTANCE);
  }
private boolean isShowInnerClasses()