Keep the child's preferred size on the main axis — it neither grows nor shrinks as the container resizes. A readable alias for proportion(0) (the default), so add(button).fixed() states the intent at the call site.
See Implementation
Keep the child's preferred size on the main axis — it neither grows nor shrinks as the container resizes. A readable alias for proportion(0) (the default), so add(button).fixed() states the intent at the call site.