message: [terminal] Screen: internal screenshot() dump to only contain main page area, not full history
diff: @@ -832,7 +832,8 @@ std::string Screen<Cell>::screenshot(function<string(LineOffset)> const& _postLi
  auto result = std::stringstream {};
  auto writer = VTWriter(result);
  - for (int const line: ranges::views::iota(-unbox<int>(historyLineCount()), *_state.pageSize.lines))
  + // for (int const line: ranges::views::iota(-unbox<int>(historyLineCount()), *_state.pageSize.lines))
  + for (int const line: ranges::views::iota(0, *_state.pageSize.lines))
  {
  for (int const col: ranges::views::iota(0, *_state.pageSize.columns))
  {
  