Comment field fixes

[Jerome-Herbinet]

Respawn of #38501 (avoids conflicts of old PR and more complete fix)

Testing from reviewers needed.

Fixes :

• Field's height when empty
• Submit button's location

Before

Capture.video.du.31-08-2023.10.51.47.webm

After

Capture.video.du.31-08-2023.10.52.10.webm

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[skjnldsv]

I think that require a fix on the vue component directly
Setting a position: relative; on the .rich-contenteditable__input seems to do the trick and wrap the placeholder.

[jancborchardt]

Visually looks good to me, but it would be best to use variables instead of fixed values here, based on var(--default-grid-baseline) (4px).

@Jerome-Herbinet a quick general note regarding reopening pull requests – it's always nicer to keep it in the existing pull request (stuff can be force pushed or rebased for example), because otherwise reviews are spread among multiple pull requests. And if you do absolutely need to do a new PR, make sure to delete the branch of the old one. :)

[Jerome-Herbinet]

Visually looks good to me, but it would be best to use variables instead of fixed values here, based on var(--default-grid-baseline) (4px).

@Jerome-Herbinet a quick general note regarding reopening pull requests – it's always nicer to keep it in the existing pull request (stuff can be force pushed or rebased for example), because otherwise reviews are spread among multiple pull requests. And if you do absolutely need to do a new PR, make sure to delete the branch of the old one. :)

OK @jancborchardt I understand, and I'll delete all my closed PRs' branches.

[skjnldsv]

Fixed with 28 and the new activity/comments merge