~jaro/balkon

ref: c5e25e2b7a77d3af82227c1151820c2f4ddc559f 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.