Merge branch...

Merge branch '60369-border-radius-still-showing-up-after-improve-diff-nav-header-was-finished' into 'master'

Breakpoints.isDesktop should not always return false

Closes #60369

See merge request gitlab-org/gitlab-ce!27240

(cherry picked from commit 44be329d)

9dca4f12 Fix isDesktop function to return proper value