src/vs/workbench/contrib/preferences/browser/preferencesRenderers.ts/HiddenAreasRenderer/render
class HiddenAreasRenderer:	render() {
		const ranges: IRange[] = [];
		for (const hiddenAreaProvider of this.hiddenAreasProviders) {
			ranges.push(...hiddenAreaProvider.hiddenAreas);
		}
		this.editor.setHiddenAreas(ranges);
	}