FIX: Break into numbered passages should preserve lines (esp. for poetry).

Regression caused by fix #367.

Author: benel

frontend/src/menu-items/BreakIntoPassagesAction.jsx

@@ -23,7 +23,7 @@ function BreakIntoPassagesAction({parallelDocuments, margin, backend, setLastUpd
   const handleClick = () => {
     let text = scholium.text
       .split(/\n{2,}/)
-      .map((x, i) => `{${i + 1}} ${x.replaceAll('\n', ' ')}`)
+      .map((x, i) => `{${i + 1}} ${x}`)
       .join('\n\n');
     backend.getDocument(scholium.id)
       .then(x => backend.putDocument({...x, text}))