fix: an index entry keeps the hard break its heading has

A book's chapter heading is "Chapter 1" and its title on two lines, and both
LibreOffice and Word copy that break into the index. We joined it into one line,
so a fixture's contents came out 18 rows short. The leader and page
number ride the last of an entry's lines (align-items: last baseline).

src/lib/editor/extensions/tableOfContents.ts

@@ -156,7 +156,11 @@ class TocView {
     const out: HeadingRef[] = [];
     this.editor.state.doc.descendants((node, pos) => {
       if (node.type.name === 'heading') {
-        const text = node.textContent.trim();
+        // A hard break inside the heading is a line of the entry too — a book's
+        // "Chapter 1" / title pair is two lines in LibreOffice's own index.
+        let raw = '';
+        node.forEach((child) => { raw += child.type.name === 'hardBreak' ? '\n' : child.textContent; });
+        const text = raw.trim();
         const level = Math.min(MAX_HEADING_LEVEL, (node.attrs.level as number) ?? 1);
         if (text && level <= max) out.push({ text, level, pos });
       }
@@ -246,7 +250,10 @@ class TocView {
       if (levelStyle) row.dataset.style = levelStyle;
       const text = document.createElement('span');
       text.className = 'toc-text';
-      text.textContent = e.text;
+      e.text.split('\n').forEach((part, li) => {
+        if (li) text.appendChild(document.createElement('br'));
+        text.appendChild(document.createTextNode(part));
+      });
       const leader = document.createElement('span');
       leader.className = 'toc-leader';
       // Real fill characters, as a word processor draws them: they scale with the font

src/lib/export/odt.ts

@@ -3268,7 +3268,7 @@ function tocXml(toc: TocExport, index: number): string {
         `</text:index-title>`
       : '') +
     toc.entries
-      .map(e => `<text:p text:style-name="${tocLevelStyle(toc, e.level)}">${escapeXml(e.text)}<text:tab/>${e.page}</text:p>`)
+      .map(e => `<text:p text:style-name="${tocLevelStyle(toc, e.level)}">${escapeXml(e.text).replace(/\n/g, '<text:line-break/>')}<text:tab/>${e.page}</text:p>`)
       .join('') +
     `</text:index-body>`;
   return `<text:table-of-content text:name="${escapeXml(name)}" text:protected="true">${source}${body}</text:table-of-content>`;

src/styles/editor.css

@@ -225,7 +225,9 @@
 }
 .paper .tiptap .toc-entry {
   display: flex;
-  align-items: baseline;
+  /* The last one: an entry whose heading carries a hard break is several lines, and the
+     leader and page number belong beside the last of them. */
+  align-items: last baseline;
   cursor: pointer;
 }
 .paper .tiptap .toc-entry:hover .toc-text {