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

Reproduce el comportamiento de F2 en pyrepl en Linux con CPython 3.13 y, a continuación, rastrea el manejo de F2 y la ruta de redibujado de la pantalla. Se considera terminado cuando la entrada actual se conserva, el cursor permanece correctamente posicionado y el dibujo posterior de la pantalla funciona con normalidad.