src/vs/base/browser/ui/tree/abstractTree.ts/TreeNodeList/setFocus
class TreeNodeList:	override setFocus(indexes: number[], browserEvent?: UIEvent, fromAPI = false): void {
		super.setFocus(indexes, browserEvent);

		if (!fromAPI) {
			this.focusTrait.set(indexes.map(i => this.element(i)), browserEvent);
		}
	}