We much let the focus widget handle input first.

This makes it so that deleting a recipe from anywhere
will have the expected result.

At the same time this makes Escape have the same effect as the
back button.

We don't want selection here.

The showing/hiding approach leaves ugly artifacts, so lets use
the existing listbox filtering machinery.

Seems clearer. The only thing that is still called author is
the recipe property.

And use the same data in both the edit page and the cuisine
details page. Avoiding redundancy again.

Avoids redundancy and keeps things consistent.

This is just a very preliminary first cut.

At the same time break out the cuisine data in a separate file,
and redo the way we associate css with the tiles.

This lets us hide empty sections on the fly.

Take out the images, use dashes and make the section wrap instead of hide,

Use css to set the image. Still not perfect, but closer.

We use a few new GTK+ properties that were introduced in 3.22.

And use this to show recipes for per diet and per chef.

A recipe can be in multiple of these at the same time.