With this option and background_color_fullscreen you can freely configure the color of your liking.

Default key binding: F9

Allow user to manually add entries to the jump list. Similar to m in
vim.

This is useful for reading documents that have a cover page in a book layout.

Every time a jump occurs its origin is saved. You can then move through
those saved positions, e.g. to return to the table of contents after
having read a section.

This feature is not yet finished, essential features like opening a
second window are not done.

Configure via background_opacity setting. Always draws fully opaque when
in fullscreen.

The config option controls whether katarakt should quit if the given
file fails to open.  The command line switch toggles this behaviour.

From now on katarakt doesn't simply quit. It stays open if there was an
error and it prompts the user for a password if required.
You should configure your icon theme for nice eye-candy :).
Additionally, press o to pick a new file to display.

The command line options right before each file will be used
individually.

auto_* removed, every action now has a fallback for layouts that don't
support smooth scrolling.
Half and full screen scrolling added.

I use QSettings in ini format. See the qt documentation to learn about
file locations. If there is no config found the default values are used.

Also, fixed memory leaks.