> OTOH, I'm worried that both 'image-transform-fit-to-width'
> and 'image-transform-fit-to-height' were declared obsolete.
>
> So I'm not going to revive them.
>
> Instead I'll implement a more useful item
> "Fill Image to Window" that will fill the image
> as much as possible to the window without leaving
> any glaring empty space.  This means applying
> either fit-to-width to vertical images (portrait orientation),
> or fit-to-height to horizontal images (landscape orientation).

This works nicely: