~jaro/balkon

ref: 85383d46341222037bb8fa91204a8349b158011e balkon/test/Data/Text/ParagraphLayout/Rich d---------
Test struts in textless box.
Test struts on paragraph with offset middle box.
Add manual test for mixed vertical alignment.
Test mixed line height with varied alignment.
Test preservation of lines with boxes.
Test boxes with no text or only a space.
Test handling of empty lines.
Test mixed line height.
Test shaping across intra-word breaks.
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.
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