~jaro/balkon

ref: ac8fab30da552128556242e1890bbb73407a8639 balkon/.golden/richParagraphLayout d---------
Describe box edges with extensible type.
Test interaction between boxes and mixed script.
Test line breaking in boxes.
Handle ancestor boxes in rich layout.
Add ancestor boxes to interface.
Test layout with mixed font sizes.
Test Rich line wrapping.
Test Rich layout.