~jaro/balkon

ref: e1e4bf7ca4771d7ce21ca1398ee1478901c3001d balkon/.golden/richParagraphLayout d---------
Test mirrored neutral characters.
Add tests for mixed text direction.
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.