src/vs/base/browser/ui/tree/abstractTree.ts/FindController/shouldAllowFocus
class FindController:	shouldAllowFocus(node: ITreeNode<T, TFilterData>): boolean {
		if (!this.widget || !this.pattern || this._mode === TreeFindMode.Filter) {
			return true;
		}

		if (this.filter.totalCount > 0 && this.filter.matchCount <= 1) {
			return true;
		}

		return !FuzzyScore.isDefault(node.filterData as any as FuzzyScore);
	}