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

cjxgm left a comment (vim/vim#21000)

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

This indeed works, though a bit tedious and maybe complex logic-wise, esp. when the foldexpr does not just produce numbers but produces a mixture of `n`, `'>n'`, `'<n'` and all those sorts of results. Anyway, I did find a way to rewrite my foldexpr with the same idea.

> 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.

The behavior being kind of a surprise is why I submit this as a bug report.


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