gh-140131: Fix REPL cursor position on Windows when module completion suggestion line hits console width

[tanloong]

When pressing TAB, the cursor moves to the end of the last printed autocomplete suggestion line, then should reposition back to where TAB was pressed. This repositioning fails when the last suggestion line's length equals the console width.

For example: The cursor starts at (column 12, row 0) when TAB is pressed. There are 3 suggestion lines, and the last one reaches the console width. The cursor moves to (column 80, row 3). When _move_relative(0, y+1) is called, the cursor should go to (column 0, row 4) but doesn’t—yet Python thinks it succeeded. When repositioning back, the cursor is supposed to move right from column 0 to 12, but it actually moves right from column 80, ending up far right.

_move_relative(0, y+1) doesn't trigger wrapping. Adding a self.__write('\r\n') ensures the cursor wraps to the new line correctly.

Here is the demo (modified from https://github.com/microsoft/terminal/issues/349#issue-399157942) showing the failed wrapping with the same constrol sequence used by `_move_relative()` for cursor movement:

```cpp #include #include #include

using std::string;
using std::cout;
using std::endl;

int main()
{
HANDLE stdOut = GetStdHandle(STD_OUTPUT_HANDLE);

DWORD consoleMode =
    ENABLE_PROCESSED_OUTPUT |
    ENABLE_WRAP_AT_EOL_OUTPUT |
    ENABLE_VIRTUAL_TERMINAL_PROCESSING;

SetConsoleMode(stdOut, consoleMode);

CONSOLE_SCREEN_BUFFER_INFO screenBufferInfo;
GetConsoleScreenBufferInfo(stdOut, &screenBufferInfo);

SHORT length = screenBufferInfo.dwSize.X;
string str(length - 1, '.');
cout << str;
cout << "x";

GetConsoleScreenBufferInfo(stdOut, &screenBufferInfo);
SHORT row1 = screenBufferInfo.dwCursorPosition.Y;

cout << "\x1b[B"; // MOVE_DOWN to the next line

GetConsoleScreenBufferInfo(stdOut, &screenBufferInfo);
SHORT row2 = screenBufferInfo.dwCursorPosition.Y;

cout << endl
  << "console width: " << length << endl
  << "cursor row before moving down: " <<  row1 << endl
  << "cursor row after moving down: " << row2  << endl;

}

..............................................................................x
console width: 79
cursor row before moving down: 25
cursor row after moving down: 25

</details>