src/vs/editor/browser/viewParts/rulers/rulers.ts/Rulers/render
class Rulers:	public render(ctx: RestrictedRenderingContext): void {

		this._ensureRulersCount();

		for (let i = 0, len = this._rulers.length; i < len; i++) {
			const node = this._renderedRulers[i];
			const ruler = this._rulers[i];

			node.setBoxShadow(ruler.color ? `1px 0 0 0 ${ruler.color} inset` : ``);
			node.setHeight(Math.min(ctx.scrollHeight, 1000000));
			node.setLeft(ruler.column * this._typicalHalfwidthCharacterWidth);
		}
	}