REPL: unexpected behavior with   (non break space) on Windows

Bug report

Bug description:

Copy " "==" " into Python REPL (the first space is non breakable, you need to generate a new one though), there are two problems I found:

1. In OS built-in terminal, it is always true

Python 3.13.12 (tags/v3.13.12:1cbe481, Feb  3 2026, 18:22:25) [MSC v.1944 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> " "==" "
True
>>> " "==" " # copied
True

2. In Vscode integrated terminal, it was false as expected at first. But if you copied from the REPL then, the non break space somehow has changed to normal space, this is the same behavior with the built-in terminal.

Python 3.13.12 (tags/v3.13.12:1cbe481, Feb  3 2026, 18:22:25) [MSC v.1944 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
Ctrl click to launch VS Code Native REPL
>>> " "==" "  
False
>>> " "==" " # copied
True

On Linux at least Ubuntu, it behave correctly as expected.

Python 3.12.3 (main, Mar  3 2026, 12:15:18) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> " "==" "
False
>>> " "==" " # copied
False

Based on testing multiple versions, it appears that​ version is not a factor.

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Windows Python REPL で比較を再現し、OS 組み込みターミナルと VS Code 統合ターミナルの両方を使用し、REPL から入力をコピーし戻す操作も含めます。まず、REPL の Windows ターミナルにおける入力処理とコピー／貼り付け処理を追跡します。改行なしスペースが通常のスペースと区別されたままになり、比較結果が一貫して false と評価されれば完了です。