This release will be available starting February 22, 2019 and affects several themes.
IMPORTANT: This release is only available for Office 365 Classic and Modern experiences and CSS-Only Themes.
Fixes
SharePoint Framework (SPFx)
We've increased the configurable minimum and maximum width range for sub-menus, providing you with greater flexibility to fine-tune your navigation's appearance.
Fixed an issue where text was getting cut off in native SharePoint sub-menus.
Addressed a layout bug where a page title's line break could incorrectly affect the header's positioning, even when the header itself was hidden.
SharePoint 2013
Resolved the issue where the SharePoint Ribbon would occasionally appear unstyled after recent updates
SharePoint CSS-Only
We've resolved the issue where the SharePoint Ribbon would occasionally appear unstyled after recent updates, ensuring consistent visual application across SharePoint Online environments.
Fixed a bug causing the web part properties panel to unexpectedly collapse after attempting to drag it.
We have successfully removed jQuery UI from our codebase.