Close the row set over ancestors only where the render pins the row

CHANGELOG.md

@@ -18,7 +18,9 @@ replacement, and each removed path, column or flag.
   `parent`, a name repeating inside one parent row, a name spelling another row's key, a table named like a column of any
   table above it, a table whose format or cell references its own family, and,
   within one render and draw group, a path drawing a table another path selects a
-  row of, or two paths pinning different rows of one table.
+  row of, or two paths pinning different rows of one table. Two reads are held to one
+  draw only where a render can pin both their rows: a path read pins a row's ancestors
+  with it, while a table read whole draws a row and pins none.
 - `New` refuses a root choice of templates sharing one format and one set of string
   fields, naming the rows TSV to write instead.
 - `misc.territory`, `misc.currency`, `misc.language`, `misc.httpstatus` and