Support block-level anchor tags which wrap around an image element in the ProseMirror schema.

[Fyorl]

Originally reported by MrPrimate#8701 https://discord.com/channels/170995199584108546/956306859491471420/1022431116222804009

ALL MODULES DISABLED? True
OS, Hosting, Browser (if applicable): Linux, Firefox, local
Short Description of bug: <a> links are removed if not text inside, this includes if there is just an img in that link
Simple steps to reproduce the bug:
Switch to html editing mode in a new page, and enter:

<p>
  <a href="assets/01-005.shield-bremen.png">
    <img src="assets/01-005.shield-bremen.png"/>
  </a>
</p>

When it saves it leaves only:

<p>
</p>

If however the link and img are outside a

tag then it leaves the img, but strips the link:

<a href="assets/01-005.shield-bremen.png">
    <img src="assets/01-005.shield-bremen.png"/>
  </a>

becomes:

<img src="assets/01-005.shield-bremen.png" style="">

[Fyorl]

Block-level image links are easy enough to represent in the schema, but having them inline might be a challenge.

[aaclayton]

I think we can view supporting block-level image links as a bugfix and view inline functionality as either a "wontfix" or as a "for future development".

[MrPrimate]

This is still happening in 10.287 where links are inside another tag, such as

as per the first example:

<p>
  <a href="assets/01-005.shield-bremen.png">
    <img src="assets/01-005.shield-bremen.png"/>
  </a>
</p>

becomes :

<p></p>

[Fyorl]

@MrPrimate Please see this comment #8275 (comment)

[MrPrimate]

Ah I misunderstood that comment - is there an issue for the inline functionality, or is this a "wontfix"?

[Fyorl]

It's mostly covered by #8130. Once we support inline image nodes, the existing link marks should apply to them without any extra work. So I think we can accommodate this in the future.