src/vs/workbench/contrib/search/common/searchModel.ts/SearchModel/cancelSearch
class SearchModel:	cancelSearch(cancelledForNewSearch = false): boolean {
		if (this.currentCancelTokenSource) {
			this.searchCancelledForNewSearch = cancelledForNewSearch;
			this.currentCancelTokenSource.cancel();
			return true;
		}
		return false;
	}