The Material 3 TextField has 2 different variants. It defines one of those variants as the "Filled" variant, which looks similar to the Material 2 version. But it also defines an "Outlined" variant, which looks very different. The Material 3 buttons also share a similar concept. This patch introduces a new property to the attached object, which we can use to implement the 2 different variants of TextField, and other controls with similar filled/outlined distinctions. [ChangeLog][Controls][Material] Added containerStyle attached property, which can be used on certain controls to change the style of the container that they are rendered in. Task-number: QTBUG-109218 Change-Id: Ic468863be14c0c44981411c8f3dbea5d1d0107b0 Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>