message: [terminal] RenderBufferBuilder: Adds missing group start/end markers for trivial line renders.
diff: @@ -238,6 +238,8 @@ void RenderBufferBuilder<Cell>::renderTrivialLine(TriviallyStyledLineBuffer cons
  lineOffset,
  columnOffset));
  }
  + output.screen[unbox<size_t>(textMargin)].groupStart = true;
  + output.screen.back().groupEnd = true;
  }
  template <typename Cell>
  