[gtk+] flowbox: Add a diagram to CSS documentation

[Matthias Clasen <matthiasc src gnome org>]

commit afc09d924e68702be0831d932b0cf4c8c7545cd9
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 10 07:39:40 2015 -0500

    flowbox: Add a diagram to CSS documentation

 gtk/gtkflowbox.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 5c5cb86..5c42dda 100644
--- 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.