To more faithfully handle inline images we need to know whether the original
link included a description - being more explicit about that will make it
easier.
see org.el/org-display-inline-images
> An inline image is a link which follows either of these
> conventions:
>
> 1. Its path is a file with an extension matching return value
> from `image-file-name-regexp' and it has no contents.
>
> 2. Its description consists in a single link of the previous
> type.
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