bug#8686: 24.0.50; `re-search-backward' does not respect `search-invisible'

[Stefan Monnier]

> Question: What is the simplest way, from Lisp, to get the "low-level
> C" search functions to optionally respect/ignore hidden text?

Something like

  (while (and (re-search-forward blabla)
              (invisible-p (point)))
    ...)

The same idea can be used with syntax-ppss to skip over matches that are
inside comments/strings.


        Stefan