spinbutton: Add undershoot nodes to CSS docs

diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index e576985ec70ad5acaf1558fae6208d5ca1aed76d..f8cd2007632dd417c01871b05418cf711c3d21f1 100644 (file)
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -90,6 +90,8 @@
  *
  * |[<!-- language="plain" -->
  * spinbutton.horizontal
+ * ├── undershoot.left
+ * ├── undershoot.right
  * ├── entry
  * │   ╰── ...
  * ├── button.down
@@ -98,6 +100,8 @@
  *
  * |[<!-- language="plain" -->
  * spinbutton.vertical
+ * ├── undershoot.left
+ * ├── undershoot.right
  * ├── button.up
  * ├── entry
  * │   ╰── ...