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

Bricktech2000 left a comment (vim/vim#21000)

I think the result you're after can be achieved this way:

```vim
set nowrap
set foldmethod=expr
set foldminlines=0
set foldexpr=getline(v:lnum)=~'^\\s'&&(getline(v:lnum-1)=~'^\\s'\|\|getline(v:lnum+1)=~'^\\s')
```

First I set 'foldminlines' to 0 so that 'foldexpr' has full control of folding. Then I modify 'foldexpr' so it doesn't produce any single-line folds: an indented line is made foldable, but only when the preceeding or following line is also indented. The result is that indented lines are foldable but lone indented lines are not---regardless of wrapping.

I will say, at a first glance it is a little odd that 'foldminlines' pretends that wrap is on even when it's off, but I'm not familiar enough with folding to comment on this.

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