~jaro/balkon

ref: 0615750e4579cfdb72cebbc24c22e23491d5e102 balkon/test/Data/Text/ParagraphLayout/Rich d---------
Test with only directionally neutral characters.
Test mirrored neutral characters.
Add tests for mixed text direction.
Consolidate tree types into one.
Test interaction between boxes and mixed script.
Test soft breaking on box spacing.
Test line breaking in boxes.
Make paragraph direction explicit in tests.
Add required textDirection to TextOptions.
Test layout with mixed font sizes.
Test Rich line wrapping.
Test Rich layout.