src/vs/editor/contrib/suggest/suggestController.ts/SuggestController/acceptSelectedSuggestion
class SuggestController:	acceptSelectedSuggestion(keepAlternativeSuggestions: boolean, alternativeOverwriteConfig: boolean): void {
		const item = this.widget.value.getFocusedItem();
		let flags = 0;
		if (keepAlternativeSuggestions) {
			flags |= InsertFlags.KeepAlternativeSuggestions;
		}
		if (alternativeOverwriteConfig) {
			flags |= InsertFlags.AlternativeOverwriteConfig;
		}
		this._insertSuggestion(item, flags);
	}