src/vs/editor/common/viewLayout/linesLayout.ts/LinesLayout/getVerticalOffsetForLineNumber
class LinesLayout:	public getVerticalOffsetForLineNumber(lineNumber: number, includeViewZones = false): number {
		this._checkPendingChanges();
		lineNumber = lineNumber | 0;

		let previousLinesHeight: number;
		if (lineNumber > 1) {
			previousLinesHeight = this._lineHeight * (lineNumber - 1);
		} else {
			previousLinesHeight = 0;
		}

		const previousWhitespacesHeight = this.getWhitespaceAccumulatedHeightBeforeLineNumber(lineNumber - (includeViewZones ? 1 : 0));

		return previousLinesHeight + previousWhitespacesHeight + this._paddingTop;
	}