~jaro/balkon

ref: 35a5cc75e3831fa3139ebb43dcf2e0948a76be16 balkon/src/Data/Text/ParagraphLayout/Internal/WithSpan.hs -rw-r--r-- 1.2 KiB 
Allow extracting ResolvedBox from WithSpan.

Separate WithSpan for sharing with other modules.