flowbox: Add a diagram to CSS documentation

diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 5c5cb86f4d0766339d8e47acdcda353091feffea..5c42dda5168c1b56180c9bd0fe6ff849bbc66f92 100644 (file)
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -54,6 +54,16 @@
  *
  * # CSS nodes
  *
+ * |[<!-- language="plain" -->
+ * flowbox
+ * ├── flowboxchild
+ * │   ╰── child
+ * ├── flowboxchild
+ * │   ╰── child
+ * ┊
+ * ╰── [rubberband]
+ * ]|
+ *
  * GtkFlowBox uses a single CSS node with name flowbox. GtkFlowBoxChild
  * uses a single CSS node with name flowboxchild.
  * For rubberband selection, a subnode with name rubberband is used.