src/vs/workbench/browser/parts/views/treeView.ts/TreeView/doRefresh
class TreeView:	private async doRefresh(elements: ITreeItem[]): Promise<void> {
		const tree = this.tree;
		if (tree && this.visible) {
			this.refreshing = true;
			await Promise.all(elements.map(element => tree.updateChildren(element, true, true)));
			this.refreshing = false;
			this._onDidCompleteRefresh.fire();
			this.updateContentAreas();
			if (this.focused) {
				this.focus(false);
			}
			this.updateCollapseAllToggle();
		}
	}