What
In the fullscreen layout, dialogs can now show a footer in its own area beneath the part that scrolls. Before, only the scrollable content was shown.
Why
A dialog's footer can stay visible while you scroll through its content.
Dialog footers have their own area in fullscreen layout
In the fullscreen layout, dialogs can now show a footer below their scrollable content, separate from it
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Terminal UIArea: what it touches
ImprovementsKind: in v2.1.314,
ImprovementsSection of the release