we've released v0.39.0 of the OOUI library this Tuesday. It will rollout on the
normal train next Tuesday, 26 May.

Highlights in this release:
- Text flow of form layouts on mobile devices was improved, surfaced
in Advanced Mobile Contributions
- Additionally this release removed deprecated icons 'beaker' and
'unTrash', both were renamed, former to 'labFlask', latter to
'restore'. Additionally 'toc' in 'icons-layout' was deprecated in this
release, as design team has decided to use 'listBullet' as unified
table of contents icon.[0]

- Added option in PopupWidget to remove close button and add custom icon to widget head. Thanks to volunteer contributor Sohom Datta!
- Remove `onLookupMenuItemChoose` event in LookupElement. It got deprecated in v0.35.2. Use onLookupMenuChoose instead.
- TagItemWidget: Remove `setDisabled` function. It was deprecated in v0.27.0.
Please look through your code, if you still occur to use them.
- Underlying library OOjs was updated to v5.0.0, up from v3.0.1,
nominally a breaking change.
Also, as new features of OOUI v0.38.0, ButtonMenuSelectWidget and IndexLayout.php#setTabPanel was newly implemented. 

You can find details on additional new features, code-level, styling
and interaction design amendments, and all improvements since v0.38.0
in the full changelog[0].

If you have any further queries or need help dealing with breaking
changes, please let me know.

As always, interactive demos[1] and library documentation is available
on mediawiki.org[2], there is comprehensive generated code-level
documentation and interactive demos and tutorials hosted on

OOUI version: 0.39.0
MediaWiki version: 1.35.0-wmf.34
Date of deployment to production: Regular train, starting Tuesday 26 May

[0] - https://gerrit.wikimedia.org/g/oojs/ui/+/v0.39.0/History.md
[1] - https://doc.wikimedia.org/oojs-ui/master/demos/#widgets-mediawiki-vector-ltr
[2] - https://www.mediawiki.org/wiki/OOUI
[3] - https://doc.wikimedia.org/oojs-ui/master/