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.

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?

Paul