src/vs/editor/common/model/pieceTreeTextBuffer/pieceTreeBase.ts/PieceTreeBase/getPieceContent
class PieceTreeBase:	getPieceContent(piece: Piece) {
		const buffer = this._buffers[piece.bufferIndex];
		const startOffset = this.offsetInBuffer(piece.bufferIndex, piece.start);
		const endOffset = this.offsetInBuffer(piece.bufferIndex, piece.end);
		const currentContent = buffer.buffer.substring(startOffset, endOffset);
		return currentContent;
	}