src/vs/editor/common/model/pieceTreeTextBuffer/pieceTreeTextBufferBuilder.ts/PieceTreeTextBufferFactory/getFirstLineText
class PieceTreeTextBufferFactory:	public getFirstLineText(lengthLimit: number): string {
		return this._chunks[0].buffer.substr(0, lengthLimit).split(/\r\n|\r|\n/)[0];
	}