~jaro/balkon

ref: 409c6d7eddc9c7f96438f7c9c2d51b1c644f1413 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.