src/vs/editor/contrib/snippet/browser/snippetSession.ts/OneSnippet/isTrivialSnippet
class OneSnippet:	get isTrivialSnippet(): boolean {
		return this._snippet.placeholders.length === 0
			|| (this._snippet.placeholders.length === 1 && this._snippet.placeholders[0].isFinalTabstop);
	}