message: [terminal_renderer] minor cleanup.
diff: @@ -1022,12 +1022,10 @@ bool BoxDrawingRenderer::renderable(char32_t codepoint) const noexcept
  return a <= codepoint && codepoint <= b;
  };
  - return ascending(0x23A1, 0x23A6) // square brackets
  - || ascending(0x2500, 0x257F) // box drawing
  - || ascending(0x2580, 0x2590) // block elements
  + return ascending(0x23A1, 0x23A6) // mathematical square brackets
  + || ascending(0x2500, 0x2590) // box drawing, block elements
  || ascending(0x2594, 0x259F) // Terminal graphic characters
  - || ascending(0x1FB00, 0x1FB3B) // block sextants
  - || ascending(0x1FB3C, 0x1FBAF) // more block elements
  + || ascending(0x1FB00, 0x1FBAF) // more block sextants
  ;
  }
  