bug#42824: 26.3; Feature request: implement 'smooth scroll' in djvu.el package

[Roland Winkler]

On Thu Oct 29 2020 dalanicolai wrote:
> Well, it is just more or less the function
> `doc-view-next-line-or-next-page` (i.e. `C-n`) slightly adapted to
> djvu-mode, because djvu-mode works slightly differently.  It is
> meant for `djvu-image-mode-only` but I have simply bound it in the
> `djvu-read-mode-map` and it seems to handle things fine.  It is
> just a small addition that slightly improves the scrolling
> experience (i.e. it becomes like that in doc-view).

Update:

I have been looking into doc-view.  It offers more complete and more
consistent support for scrolling and I am trying to find out how
this can possibly be ported to djvu.el.

On the other hand, I am also wondering whether it could make sense
to add a backend for djvu files to doc-view.  Probably this depends
on what users want to do.  I started djvu.el for editing djvu
documents which is often very different from viewing such files.

> While I am here anyway, I have also created some code to implement
> `djvu-occur` similar to `pdf-occur` (but synchronous instead of
> async) which works fine for most djvu documents.

Did I see correctly that this code relies on `convert' from
imagemagic for updating the images?

I need some more time to understand better what the code is doing.