Bug report

Bug description:

Pasting multiline content with long lines (more columns than the current terminal width) causes an unusual behavior on the REPL display, this happens on cmd and powershell.

x = None
y = {"a": 1, "b": 2, "c": 3, "d": 4, "e": 5, "f": 6, "g": 7, "h": 8, "i": 9, "j": 10}

Pasting this snippet in the REPL will cause this:

The interpreter actually handles the content correctly, but the editing of this is weird and leads to confusion.

Video Example

More info

I believe this issue is windows-only, as far as I have tested, this works perfectly on Ubuntu 22.
Python 3.13 didn't have this issue, while 3.14 introduced this and 3.15 still has it.

CPython versions tested on:

3.15

Operating systems tested on:

Windows

Linked PRs

• gh-144259: Fix Windows EOL wrap by syncing real console cursor  #144297