message: [terminal] RenderBufferBuilder: fixes off-by-one write bug when trivial line fills full page width.
diff: @@ -239,9 +239,13 @@ void RenderBufferBuilder<Cell>::renderTrivialLine(TriviallyStyledLineBuffer cons
  lineOffset,
  columnOffset));
  }
  +
  + if (textMargin != pageColumnsEnd)
  + {
  output.screen[unbox<size_t>(textMargin)].groupStart = true;
  output.screen.back().groupEnd = true;
  }
  +}
  template <typename Cell>
  void RenderBufferBuilder<Cell>::startLine(LineOffset _line) noexcept
  