src/vs/editor/common/viewLayout/linesLayout.ts/LinesLayout/constructor
class LinesLayout:	constructor(lineCount: number, lineHeight: number, paddingTop: number, paddingBottom: number) {
		this._instanceId = strings.singleLetterHash(++LinesLayout.INSTANCE_COUNT);
		this._pendingChanges = new PendingChanges();
		this._lastWhitespaceId = 0;
		this._arr = [];
		this._prefixSumValidIndex = -1;
		this._minWidth = -1; /* marker for not being computed */
		this._lineCount = lineCount;
		this._lineHeight = lineHeight;
		this._paddingTop = paddingTop;
		this._paddingBottom = paddingBottom;
	}