Under the hood
No documentation found
The selectable list component gains column-sizing options and a way to defer keyboard handling elsewhere
What
The internal selectable-list UI component now accepts a columnSizingOptions setting, used to compute column widths in compact vertical layouts, defaulting to the same list of options being shown. It also accepts a keysDeferred setting; when supplied and it signals true, the component's keyboard shortcuts are wrapped so key handling can be deferred to something else instead of being handled directly, and the component is kept active while this is in effect.
Why
This is internal UI plumbing that gives list-based menus more control over layout and keyboard handling; it doesn't describe a specific user-facing feature on its own.
Names in the bundlecolumnSizingOptionskeysDeferred