I'm not sure if just adding the case for """) is enough or if we need to be more "elixir-aware".

Other scenarios would be having ~H inside arrays, so we could have """, but then it can also be inside a tuple, which depending on the scenario can be formatted with """, anything here}

I think the main problem is that the elixir formatter changes

foo(
  ~H"""
    <div>something</div>
  """
)

into

foo(~H"""
  <div>something</div>
""")

Which makes so that the "correct format" doesn't highlight properly.

Is there anything I can do to help with that?