~jaro/balkon

ref: 3d78355411f15c6d8ebf001921a5167657992712 balkon/src/Data/Text/ParagraphLayout/ResolvedSpan.hs -rw-r--r-- 831 bytes
Minimise working with Data.Text.Internal.
Use ICU to find line break boundaries.
Implement run splitting.
Store span index in ResolvedSpan.
Implement absolute line heights with half-leadings.
Implement "plain" interface.