Allow `--shift-heading-level-by=-1` to work in djot...

...in the same way it works for other formats (with the top-level
heading being promoted to metadata title).  This needed special
treatment because of the way djot surrounds sections with Divs.

Closes #10459.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/command/10459.md b/test/command/10459.md
new file mode 100644
index 000000000..b45950cf0
--- /dev/null
+++ b/test/command/10459.md
@@ -0,0 +1,11 @@
+```
+% pandoc -s --shift-heading-level-by=-1 -f djot -t native
+# hi
+^D
+Pandoc
+  Meta
+    { unMeta =
+        fromList [ ( "title" , MetaInlines [ Str "hi" ] ) ]
+    }
+  [ Div ( "hi" , [ "section" ] , [] ) [] ]
+```