The removed lines appear to be fully contrived, as there is no
apparent case where the server would deliver a block of HTML
with `.message_inline_image` without also delivering an inner
<img> or <video> element.
It appears the original outer block was introduced as part of
3df0cacd9e for ensuring coverage
of the post-processing of the `title` attribute to `aria-label`,
which change has since become covered by numerous other
non-contrived examples.
The replaced (and contrived) `<a role="button">` part introduced
by 911b3b5365 is meant to test the
absence of an `href` attribute, which is the minimal new line
introduced here to maintain test coverage while also testing
a genuinely possible pattern a user could send, namely
`[missing href]()`.
See https://chat.zulip.org/#narrow/channel/43-automated-testing/topic/unusual.20.60.2Emessage_inline_image.60.20HTML/with/2261114 for further discussion.
