~jaro/balkon

ref: 28ccd0eea7abd52f74e27f388aae4e0979909ca8 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.