src/vs/editor/contrib/suggest/suggestWidget.ts/SuggestWidget/_select
class SuggestWidget:	private _select(item: CompletionItem, index: number): void {
		const completionModel = this._completionModel;
		if (completionModel) {
			this._onDidSelect.fire({ item, index, model: completionModel });
			this.editor.focus();
		}
	}