pyrepl loses input and mis-positions cursor when F2 is pressed

Bug report

Bug description:

This is bad for 2 different reasons:

1. pyrepl loses track of the cursor, thinking it's in the first column when it's actually in the middle of the screen somewhere, so future screen drawing operations have unexpected results
2. on top of that, anything you were in the middle of typing when you pressed F2 is discarded, so if you wanted to access the history to copy something out and paste it into the command you're writing, oops, it's gone

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Riproduci il comportamento di F2 in pyrepl su Linux con CPython 3.13, quindi traccia la gestione di F2 e il percorso di ridisegno dello schermo. Il lavoro è completato quando l'input corrente viene preservato, il cursore rimane posizionato correttamente e il disegno successivo dello schermo funziona normalmente.