[gnome-bluetooth/gnome-3-28] settings-widget: Set a11y relationship for Devices list label

[Bastien Nocera <hadess src gnome org>]

commit 8382bd48a93547b05f35fdf17bed4ce85c15d84d
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Thu Jan 3 12:22:09 2019 -0500

    settings-widget: Set a11y relationship for Devices list label
    
    This allows screen readers to correctly identify "Devices"
    as a header label for the devices listbox.

 lib/bluetooth-settings-widget.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/lib/bluetooth-settings-widget.c b/lib/bluetooth-settings-widget.c
index 78804181..9e944287 100644
--- a/lib/bluetooth-settings-widget.c
+++ b/lib/bluetooth-settings-widget.c
@@ -64,6 +64,7 @@ struct _BluetoothSettingsWidgetPrivate {
        char                *selected_object_path;
 
        /* Device section */
+       GtkWidget           *device_label;
        GtkWidget           *device_list;
        GtkAdjustment       *focus_adjustment;
        GtkSizeGroup        *row_sizegroup;
@@ -1517,7 +1518,7 @@ add_device_section (BluetoothSettingsWidget *self)
        gtk_box_pack_start (GTK_BOX (box), hbox, FALSE, TRUE, 0);
 
        s = g_markup_printf_escaped ("<b>%s</b>", _("Devices"));
-       widget = gtk_label_new (s);
+       priv->device_label = widget = gtk_label_new (s);
        g_free (s);
        gtk_label_set_use_markup (GTK_LABEL (widget), TRUE);
        gtk_misc_set_alignment (GTK_MISC (widget), 0, 0.5);
@@ -1549,6 +1550,12 @@ add_device_section (BluetoothSettingsWidget *self)
                                    (GtkListBoxSortFunc)device_sort_func, NULL, NULL);
        g_signal_connect_swapped (widget, "row-activated",
                                  G_CALLBACK (activate_row), self);
+        atk_object_add_relationship (ATK_OBJECT (gtk_widget_get_accessible (priv->device_label)),
+                                     ATK_RELATION_LABEL_FOR,
+                                     ATK_OBJECT (gtk_widget_get_accessible (priv->device_list)));
+        atk_object_add_relationship (ATK_OBJECT (gtk_widget_get_accessible (priv->device_list)),
+                                     ATK_RELATION_LABELLED_BY,
+                                     ATK_OBJECT (gtk_widget_get_accessible (priv->device_label)));
 
        priv->device_stack = gtk_stack_new ();
        gtk_stack_set_homogeneous (GTK_STACK (priv->device_stack), FALSE);