Re: How to preserve manually defined folds when switching to expr within a session?

Bao Niu wrote:

> I use a plugin that uses expr foldmethod. From time to time I want the
> flexibility to manually define my folds. I just switch to manual by:
> setlocal foldmethod=manual
> and all those foldlevels calculated by the expr is still there, which
> is perfect!
>
> However, when later on I want to use that expr mode to fold some newly
> added content up again, there seems no easy way. If just switch back
> by:
> setlocal foldmethod=expr
> I'd lose all my manually defined foldlevels! Is there a way to
> preserve my manually defined folds when switching back to expr?

This is not possible. When using "expr" the folds are defined by the
'foldexpr' setting. Vim evaluates that for any screen redraw, and
changing the 'foldmethod' setting forces a screen redraw.

A complicated method would be to somehow store the current folds and
have 'foldexpr' use this information to define the folds. It's not
easy, because when you insert/delete lines the position of the folds
will change.

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