On Sun, Oct 1, 2017 at 3:21 PM, Paul Pogonyshev <pogonyshev@gmail.com>
wrote:

> Hi,
>
> My mode implements filtering in a read-only buffer by attaching
> `invisible' property to text chunks and then modifying
> `buffer-invsibility-spec' variable. This way I can hide/show large pieces
> of text pretty much instantly and without modifying anything. However, I
> noticed that commands like M-f etc. still "see through" the hidden text and
> will stop at points where something is hidden.
>

​If you use Emacs outline-mode or the GNU Hyperbole package's Koutliner
mode, you'll see they both move past invisible *lines* of text all at
once.  Each Emacs buffer contains a buffer-display-table with a
display-table slot that handles invisible lines.  See the doc. for
buffer-display-table.​

​​
> Question: is it somehow possible to make M-f and so on (of course, for
> interactive use only) ignore invisible text completely, as if it was not
> there at all? If not, could such a feature be implemented in future?
>
​​
​​If you want this to work for invisible fields rather than lines, I think
you'll have to write your own mode which overlays all the movement
commands.  Hyperbole's Koutline mode does this too, so you can use that as
an example, see:

   https://git.savannah.gnu.org/cgit/hyperbole.git/tree/kotl/kotl-mode.el

It is involved to get this right.

Bob