[gtk/ebassi/new-a11y: 22/29] a11y: Update the accessible label for GtkButton

[Emmanuele Bassi <ebassi src gnome org>]

commit f949731cec6bdda9615f4f2c5b4b1621041f8b92
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Jul 13 17:04:38 2020 +0100

    a11y: Update the accessible label for GtkButton

 gtk/gtkbutton.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gtk/gtkbutton.c b/gtk/gtkbutton.c
index 3177d95fc2..5fc6069336 100644
--- a/gtk/gtkbutton.c
+++ b/gtk/gtkbutton.c
@@ -837,6 +837,10 @@ gtk_button_set_label (GtkButton   *button,
   gtk_label_set_label (GTK_LABEL (priv->child), label);
   gtk_button_set_child_type (button, LABEL_CHILD);
 
+  gtk_accessible_update_property (GTK_ACCESSIBLE (button),
+                                  GTK_ACCESSIBLE_PROPERTY_LABEL, label,
+                                  -1);
+
   g_object_notify_by_pspec (G_OBJECT (button), props[PROP_LABEL]);
 }