Re: RFC: [PATCH] isearch enhancements: symbol mode; syntactic filtering

[Juri Linkov]

>> While we are thinking about this: I think sometimes it would be good
>> to search only visible text. (Especially in org-mode.)
>
> I thought Juri already mentioned that as one of the filtering possibilities.

Yes, the default value of `isearch-filter-predicate' is 
`isearch-filter-visible'.
But to avoid conflicts with other possible filters, it should support a list
of filters and behave like e.g. `run-hook-with-args-until-success'.

> Anyway, FWIW, in Isearch+, `C-+' toggles searching invisible text.  So yes, I
> agree with you.  Trivial to do, and useful IMO.

Then `C-+' could just add/remove `isearch-filter-visible' to/from
`isearch-filter-predicate'.