paned: Add diagrams to CSS documentation

diff --git a/gtk/gtkpaned.c b/gtk/gtkpaned.c
index d749d648a88d6c3eb096debbfc76e519c5bb546f..a959c6c9e88fb01dd2ecdbc300ad5ecc61a1938f 100644 (file)
--- a/gtk/gtkpaned.c
+++ b/gtk/gtkpaned.c
@@ -78,6 +78,11 @@
  *
  * # CSS nodes
  *
+ * |[<!-- language="plain" -->
+ * paned
+ * ╰── separator
+ * ]|
+ *
  * GtkPaned has a main CSS node with name paned, and a subnode for
  * the separator with name separator.
  *