src/vs/workbench/contrib/notebook/common/model/notebookCellTextModel.ts/NotebookCellTextModel/getFullModelRange
class NotebookCellTextModel:	getFullModelRange() {
		const lineCount = this.textBuffer.getLineCount();
		return new Range(1, 1, lineCount, this.textBuffer.getLineLength(lineCount) + 1);
	}