REPL doesn't handle blocks larger than the console window on some terminals

Bug report

Bug description:

On Windows, if the currently edited block does not fit in the console (the lines are too long and there are too many lines), and the cursor is moved around, the REPL's state gets corrupted: lines are overwritten with parts of other lines, parts of the prompt appear in places, the cursor behaviour doesn't match the text around it.

For example, in a small console window, I pressed Up to go back in history to this piece of colorsys:

def yiq_to_rgb(y, i, q):
    # r = y + (0.27*q + 0.41*i) / (0.74*0.41 + 0.27*0.48)
    # b = y + (0.74*q - 0.48*i) / (0.74*0.41 + 0.27*0.48)
    # g = y - (0.30*(r-y) + 0.11*(b-y)) / 0.59

    r = y + 0.9468822170900693*i + 0.6235565819861433*q
    g = y - 0.27478764629897834*i - 0.6356910791873801*q
    b = y - 1.1085450346420322*i + 1.7090069284064666*q

    if r < 0.0:
        r = 0.0
    if g < 0.0:
        g = 0.0
    if b < 0.0:
        b = 0.0
    if r > 1.0:
        r = 1.0
    if g > 1.0:
        g = 1.0
    if b > 1.0:
        b = 1.0
    return (r, g, b)

and then pressed some arrow keys to get:

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

首先，在一个对于多行 colorsys 块来说过小的控制台窗口中重现 Windows 上的 REPL 编辑失败，然后检查 REPL 的历史记录和光标编辑入口点。执行报告中描述的箭头键交互，并验证当代码块超出窗口时，行、提示符和光标位置仍保持对齐。