@Override
  public final @NotNull MultiplePsiFilesPerDocumentFileViewProvider createCopy(@NotNull VirtualFile fileCopy) {
    MultiplePsiFilesPerDocumentFileViewProvider copy = cloneInner(fileCopy);
    copy.myOriginal = myOriginal == null ? this : myOriginal;
    return copy;
  }
@Override
  public final @NotNull MultiplePsiFilesPerDocumentFileViewProvider createCopy(@NotNull VirtualFile fileCopy)