src/vs/workbench/contrib/notebook/common/notebookEditorModel.ts/SimpleNotebookEditorModel/isOrphaned
class SimpleNotebookEditorModel:	isOrphaned(): boolean {
		return SimpleNotebookEditorModel._isStoredFileWorkingCopy(this._workingCopy) && this._workingCopy.hasState(StoredFileWorkingCopyState.ORPHAN);
	}