scrollbar: Add new API to gtk4-sections.txt

and update the css node docs

docs/reference/gtk/gtk4-sections.txt

@@ -2524,6 +2524,8 @@ gtk_scrollable_get_type
 <TITLE>GtkScrollbar</TITLE>
 GtkScrollbar
 gtk_scrollbar_new
+gtk_scrollbar_get_adjustment
+gtk_scrollbar_set_adjustment
 <SUBSECTION Standard>
 GTK_SCROLLBAR
 GTK_IS_SCROLLBAR

gtk/gtkrange.c

@@ -458,6 +458,7 @@ gtk_range_class_init (GtkRangeClass *class)
   g_object_class_install_properties (gobject_class, LAST_PROP, properties);
 
   gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_RANGE_ACCESSIBLE);
+  gtk_widget_class_set_css_name (widget_class, "range");
 }
 
 static void

gtk/gtkscrollbar.c

@@ -26,7 +26,7 @@
 #include "config.h"
 
 #include "gtkscrollbar.h"
-#include "gtkrangeprivate.h"
+#include "gtkrange.h"
 
 #include "gtkadjustment.h"
 #include "gtkintl.h"
@@ -59,17 +59,15 @@
  *
  * |[<!-- language="plain" -->
  * scrollbar[.fine-tune]
- * ╰── contents
- *     ├── [button.up]
- *     ├── [button.down]
- *     ├── trough
- *     │   ╰── slider
- *     ├── [button.up]
- *     ╰── [button.down]
+ * ╰── box
+ *     ╰── range
+ *         ╰── trough
+ *             ╰── slider
  * ]|
  *
  * GtkScrollbar has a main CSS node with name scrollbar and a subnode for its
- * contents, with subnodes named trough and slider.
+ * contents. Both the main node and the box subnode get the .horizontal or .vertical
+ * style classes applied, depending on the scrollbar's orientation.
  *
  * The main node gets the style class .fine-tune added when the scrollbar is
  * in 'fine-tuning' mode.

gtk/gtkscrollbar.h

@@ -30,7 +30,7 @@
 #error "Only <gtk/gtk.h> can be included directly."
 #endif
 
-#include <gtk/gtkrange.h>
+#include <gtk/gtkwidget.h>
 
 
 G_BEGIN_DECLS