src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts/MainThreadLanguageFeatures/$registerSelectionRangeProvider
class MainThreadLanguageFeatures:	$registerSelectionRangeProvider(handle: number, selector: IDocumentFilterDto[]): void {
		this._registrations.set(handle, modes.SelectionRangeRegistry.register(selector, {
			provideSelectionRanges: (model, positions, token) => {
				return this._proxy.$provideSelectionRanges(handle, model.uri, positions, token);
			}
		}));
	}