private boolean affectsMultiplePhysicalDocs() {
    Set<VirtualFile> affectedFiles = new HashSet<>();
    for (DocumentReference each : myAllAffectedDocuments) {
      VirtualFile file = each.getFile();
      if (isVirtualDocumentChange(file)) continue;
      affectedFiles.add(file);
      if (affectedFiles.size() > 1) return true;
    }
    return false;
  }
private boolean affectsMultiplePhysicalDocs()