code: public static Set<String> findGraphFilesToImport( File appDirectory, File editedFile, String fileContent ) {
  
  		File graphDir = new File( appDirectory, Constants.PROJECT_DIR_GRAPH );
  		return findFilesToImport( graphDir, Constants.FILE_EXT_GRAPH, editedFile, fileContent );
  	}
docs: Finds all the graph files that can be imported.
  @param appDirectory the application's directory
  @param editedFile the graph file that is being edited
  @param fileContent the file content (not null)
  @return a non-null set of (relative) file paths