[vim/vim] long lines automatically become foldable even with set nowrap (Issue #21000)

cjxgm created an issue (vim/vim#21000)

### Steps to reproduce

Type some text, with some lines extremely long, beyond the screen.

```vimscript
set nowrap
set foldmethod=expr
set foldexpr='>1'
```

You should see some lines are folded, and each of those folded lines can unfold to a single line. If not, fold all by `zM`

### Expected behaviour

No lines become foldable.

I can see why they are foldable. If you set wrap, long lines wrap to multiple lines, so they becoming foldable is reasonable. But with set nowrap, it makes no sense to make long lines foldable, as you will be folding single line into single line.

### Version of Vim

9.2 (2026 Feb 14) included patches 1-849

### Environment

Arch Linux

### Logs and stack traces

```shell

```

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