src/vs/editor/contrib/folding/browser/folding.ts/FoldingController/setFoldingRangeProviderSelector
class FoldingController:	public static setFoldingRangeProviderSelector(foldingRangeSelector: FoldingRangeProviderSelector): IDisposable {
		FoldingController._foldingRangeSelector = foldingRangeSelector;
		return { dispose: () => { FoldingController._foldingRangeSelector = undefined; } };
	}