switch: Add a diagram to CSS node documentation

diff --git a/gtk/gtkswitch.c b/gtk/gtkswitch.c
index f747d742b01ccf6b47ac04f42afff989d57c1e69..764820924d98040d629361f50a8c33f42b872e4b 100644 (file)
--- a/gtk/gtkswitch.c
+++ b/gtk/gtkswitch.c
@@ -38,6 +38,11 @@
  *
  * # CSS nodes
  *
+ * |[<!-- language="plain" -->
+ * switch
+ * ╰── slider
+ * ]|
+ *
  * GtkSwitch has two css nodes, the main node with the name switch and a subnode
  * named slider. Neither of them is using any style classes.
  */