ConstraintLayout

• android:layout_width and android:layout_height are back being non-optional due to compatibility issues.

Helpers

• added a way to animate or jump directly to a given item of a Carousel
• new CircularFlow helper

MotionLayout

• Programmatic support for inserting and removing onSwipe and onClick on Transitions
• Experimental Support for Transitions through screen rotation
• support duration argument to transitions
• Better support for customAttributes that are boolean or References