fix(UX): Add a subject field.

[bosue]

Fixes #22547.
Fixes #22632.

[bosue]

@ssuda: Thanks for your review! We may not yet be there, but getting closer.

If we want to remove the description field from the list view – and I think we should – then we probably need an upgrade patch copying over descriptions – stripped to plain text – to the new subject field.

Unit tests need another tweak as well. Will look into it as soon as I can find some time.

[barredterra]

Preferred implementation approach: #22632 (comment)

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed within 3 days if no further activity occurs, but it only takes a comment to keep a contribution alive :) Also, even if it is closed, you can always reopen the PR when you're ready. Thank you for contributing.

[bosue]

Maybe we can do both. Stripping the html is a bugfix that can be backported to previous major versions. So this should be a priority. Introducing the subject field could be a breaking feature for a future major version.

Originally posted by @barredterra in #22632 (comment)

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed within 3 days if no further activity occurs, but it only takes a comment to keep a contribution alive :) Also, even if it is closed, you can always reopen the PR when you're ready. Thank you for contributing.