Restore colors on the Job configuration page, help page, and other controls (regression in 2.239).
(pull 4781)
Convert arrow icons from images to CSS.
(issue 62496)
Restyle side panel widgets to have a more modern look & feel.
(issue 62175)
Developer: Plugins can now more easily add support for using build steps in pipelines with access to the appropriate environment variables (such as from tools/environment blocks or steps like withEnv).
The fingerprint and archiveArtifacts pipeline steps will no longer apply any environment substitution.
(issue 29144)