~jaro/balkon

ref: 6e011c818a62f3d3ae7554f67f24fc8f3abf031b balkon/test/Data d---------
Allow generating an empty run.
Store default level in BiDiLevels.

This will be required for handling empty text sequences.
Test with AlignStart by default.
Test centred paragraph.
Test right-aligned paragraph.
Internally mark hard line breaks.
Internally allow splitting texts at endpoints.

This is required in order to preserve a hard line break at the end of
the input.
Test handling of empty lines.
Test mixed line height.
Test ultra narrow Arabic text.
Test unions of lists of rectangles.
Parametrise rectangle union bias.
Test shaping across intra-word breaks.
Simplify code since run direction is always known.
Improve BiDi handling of numbers and neutrals.
Test with only directionally neutral characters.
Test mirrored neutral characters.
Add shaped runs output for bidirectional text.
Add tests for mixed text direction.
Test spanToRuns independently for scripts/directions.
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