We just published ConstraintLayout beta 3. As always, it's available in the SDK Manager (under the "Support Repository" section).
This release fixes several bugs related to layout resolution; WRAP_CONTENT support in particular has been improved when using chains. Min/max dimensions on the ConstraintLayout itself are now correctly supported (android:minWidth, android:maxWidth, android:minHeight, android:maxHeight). We encourage everyone to update to this new version!
Note: if you are using Android Studio 2.2 and it is your first installation of ConstraintLayout (or you had a version older than alpha 8), you might have to restart studio (or invalidate caches) after installing this version (the editor behavior may not be correct, with widgets temporarily snapping to the top left corner).
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