* TODO [Enhancement] Handle displays not capable of displaying images

Currently this is tested with =display-graphic-p= instead of
=display-images-p=.  Another thing to consider is whether an image
created with =(insert-image ... ALT)= works better than inserting
text.

* TODO [Bug] SVGs containing images are not rendered correctly

This seems to mostly happen with librsvg as it fails to resolve these
relative to the current directory.  Might require Emacs patches.

An alternative "solution" is to edit SVGs to not contain relative
paths after unzipping...

Update: Someone on emacs-devel posted a patch for the former strategy:
https://lists.gnu.org/archive/html/emacs-devel/2020-12/msg00119.html

* TODO [Enhancement] Remember document position after redrawing with g

https://github.com/emacs-evil/evil-collection/blob/master/modes/nov/evil-collection-nov.el#L41

Ultimately this is a problem of exposing the render function as
interactive command.  This turned out to be a mistake, but can be
fixed by renaming it to a double-dashed version, marking the original
as obsolete and creating a new command that remembers the position.
The new function could then restore position and maybe even reuse

* TODO [Enhancement] Remember document position for navigation with t/n/p

Much like with remembering the last viewed position per file, you
could remember it per document.  It doesn't make sense for navigation
with =SPC= and =S-SPC= to do this though, so an override is required
(like an optional parameter or explicitly setting the position to
=(point-min)= when using =SPC=).

* TODO [Feature] Support FB2 format

This basically amounts to a full rewrite using generic functions.  It
doesn't help the format is used for Russian literature mostly and is
documented in terms of a few XML files.

http://gribuser.ru/xml/fictionbook/index.html.en

* TODO [Feature] Info-like continuous search

There are a few approaches to this, none of them strike me as good
enough to pursue:

- Using grep to do fuzzy matching, then jumping to the "right"
  location.  Tricky because there is no correspondance between
  rendered buffer and HTML source.  Rejected on emacs-devel:
  https://lists.gnu.org/archive/html/emacs-devel/2020-02/msg00096.html
- Using =dom-texts= on the HTML parse trees, then jumping to the
  "right" location using fuzzy matching of the text.
- Using isearch in one document, then loading up the adjacent one if
  needed.  Slow unless caching is used and implementing that is
  another can of worms.