src/vs/editor/browser/viewParts/viewZones/viewZones.ts/ViewZones/_layoutZone
class ViewZones:	private _layoutZone(whitespaceAccessor: IWhitespaceChangeAccessor, id: string): boolean {
		if (this._zones.hasOwnProperty(id)) {
			const zone = this._zones[id];
			const props = this._computeWhitespaceProps(zone.delegate);
			zone.isInHiddenArea = props.isInHiddenArea;
			// const newOrdinal = this._getZoneOrdinal(zone.delegate);
			whitespaceAccessor.changeOneWhitespace(zone.whitespaceId, props.afterViewLineNumber, props.heightInPx);
			// TODO@Alex: change `newOrdinal` too

			this._safeCallOnComputedHeight(zone.delegate, props.heightInPx);
			this.setShouldRender();

			return true;
		}
		return false;
	}