T.P.Writers.Shared toTableOfContents: handle nested Divs better.

Closes #8402.

src/Text/Pandoc/Writers/Shared.hs

@@ -454,6 +454,7 @@ sectionToListItem opts (Div (ident,_,_)
                    then headerText'
                    else [Link ("toc-" <> ident, [], []) headerText' ("#" <> ident, "")]
    listContents = filter (not . null) $ map (sectionToListItem opts) subsecs
+sectionToListItem opts (Div _ [d@Div{}]) = sectionToListItem opts d -- #8402
 sectionToListItem _ _ = []
 
 -- | Returns 'True' iff the list of blocks has a @'Plain'@ as its last

test/command/8402.md

@@ -0,0 +1,52 @@
+```
+% pandoc --toc -s -t markdown
+::: {.cell .markdown id="6u8qXoeFGdqt"}
+# Summary
+> Expand to see summary
+
+## Overview and Explanation
+:::
+
+# Details
+
+## inner 1
+text
+
+## inner 2
+
+### inner inner 1
+
+## inner 3
+text
+^D
+-   [Summary](#summary){#toc-summary}
+    -   [Overview and
+        Explanation](#overview-and-explanation){#toc-overview-and-explanation}
+-   [Details](#details){#toc-details}
+    -   [inner 1](#inner-1){#toc-inner-1}
+    -   [inner 2](#inner-2){#toc-inner-2}
+        -   [inner inner 1](#inner-inner-1){#toc-inner-inner-1}
+    -   [inner 3](#inner-3){#toc-inner-3}
+
+::: {#6u8qXoeFGdqt .cell .markdown}
+# Summary
+
+> Expand to see summary
+
+## Overview and Explanation
+:::
+
+# Details
+
+## inner 1
+
+text
+
+## inner 2
+
+### inner inner 1
+
+## inner 3
+
+text
+```