[gtk/matthiasc/a11y] paned: Set accessible value properties

[Matthias Clasen <matthiasc src gnome org>]

commit 0fda8f5211454dfe61dbe5cbaad719d2f46ebf30
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 11 11:30:54 2020 -0400

    paned: Set accessible value properties
    
    This is what we did in GTK 3.

 gtk/gtkpaned.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gtk/gtkpaned.c b/gtk/gtkpaned.c
index 8ac244d483..929779a39a 100644
--- a/gtk/gtkpaned.c
+++ b/gtk/gtkpaned.c
@@ -1385,6 +1385,14 @@ gtk_paned_size_allocate (GtkWidget *widget,
 
       gtk_widget_set_child_visible (paned->handle_widget, FALSE);
     }
+
+  gtk_accessible_update_property (GTK_ACCESSIBLE (paned),
+                                  GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, 0.0,
+                                  GTK_ACCESSIBLE_PROPERTY_VALUE_MAX,
+                                      (double) (paned->orientation == GTK_ORIENTATION_HORIZONTAL ?  width : 
height),
+                                  GTK_ACCESSIBLE_PROPERTY_VALUE_NOW,
+                                      (double) paned->start_child_size,
+                                  -1);
 }