Re: search-invisible and friends

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  emacs-devel@gnu.org
> Date: Thu, 10 Sep 2020 14:35:50 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Right, but we wouldn't to re-implement the test in isearch.el, so the
> >> question is to find an existing function which gives us the answer.
> >
> > We'd need to write it, I think.
> 
> So basically mash up this stuff into a convenient DEFUN?
> 
>         && !NILP (val = get_char_property_and_overlay
>                             (make_fixnum (PT), Qdisplay, selected_window,
>                              &overlay))
>         && display_prop_intangible_p (val, overlay, PT, PT_BYTE)

Yes, something like that.

But what about 'display' properties on overlay strings? do we want to
support that as well?

> I also read the "Display Specs That Replace The Text" node in the
> manual, but I'm not quite sure what the relevance is here -- it talks
> about how (display) text properties are collated (i.e., merged over eq
> sequences of text), but does isearch have to deal with that?

The rest of the section makes a point of saying, for each display
property kind, whether it is replacing or not.