~jaro/balkon

ref: e9a66c263f577e003e031e881e3b8bf1e7938ea0 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.