Decrement renderer level after section recursion (#16)

The html renderer section level used for title numbering is incremented
when entering a new section so that subsections get correct heading
elements. Match the increment with a decrement after having rendered the
section contents, so that multiple consecutive sections would stay
consistent.

Add a test to verify this behaviour.

1 files changed, 1 insertions, 0 deletions

diff --git a/renderer/src/html.rs b/renderer/src/html.rs
index 0092315..bb7c42e 100644
--- a/renderer/src/html.rs
+++ b/renderer/src/html.rs
@@ -152,6 +152,7 @@ impl HTMLRender for e::Section {
 			writeln!(renderer.stream)?;
 		}
 		write!(renderer.stream, "</section>")?;
+		renderer.level -= 1;
 		Ok(())
 	}
 }