src/vs/workbench/contrib/search/browser/searchView.ts/SearchView/selectTreeIfNotSelected
class SearchView:	private selectTreeIfNotSelected(): void {
		if (this.tree.getNode(null)) {
			this.tree.domFocus();
			const selection = this.tree.getSelection();
			if (selection.length === 0) {
				const event = getSelectionKeyboardEvent();
				this.tree.focusNext(undefined, undefined, event);
				this.tree.setSelection(this.tree.getFocus(), event);
			}
		}
	}