src/vs/editor/common/viewModel/overviewZoneManager.ts/OverviewRulerZone/constructor
class OverviewRulerZone:	constructor(
		startLineNumber: number,
		endLineNumber: number,
		heightInLines: number,
		color: string
	) {
		this.startLineNumber = startLineNumber;
		this.endLineNumber = endLineNumber;
		this.heightInLines = heightInLines;
		this.color = color;
		this._colorZone = null;
	}