~jaro/balkon

ref: 7dc45d1deab5d7d7e967fe2056f322f0dabac0bc balkon/src/Data/Text/ParagraphLayout/Internal/ParagraphExtents.hs -rw-r--r-- 925 bytes 
Allow paragraphRect without point 0,0.

Parametrise rectangle union bias.

Separate interface-independent constants.