[gnome-control-center] common: Disable language chooser confirm button until a language is selected

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8af63dc40a1a178857d0e7e45dfaf0e4a2ccebe8
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Aug 22 11:54:44 2018 +1200

    common: Disable language chooser confirm button until a language is selected
    
    Make the button insenstive until a language is chosen as per:
    https://wiki.gnome.org/Design/SystemSettings/RegionAndLanguage

 panels/common/cc-language-chooser.c  | 3 +++
 panels/common/cc-language-chooser.ui | 1 +
 2 files changed, 4 insertions(+)
---
diff --git a/panels/common/cc-language-chooser.c b/panels/common/cc-language-chooser.c
index 6a188216c..445952a51 100644
--- a/panels/common/cc-language-chooser.c
+++ b/panels/common/cc-language-chooser.c
@@ -295,6 +295,8 @@ set_locale_id (CcLanguageChooser *chooser,
         g_autoptr(GList) children = NULL;
         GList *l;
 
+        gtk_widget_set_sensitive (chooser->done_button, FALSE);
+
         children = gtk_container_get_children (GTK_CONTAINER (chooser->language_listbox));
         for (l = children; l; l = l->next) {
                 GtkWidget *row = l->data;
@@ -307,6 +309,7 @@ set_locale_id (CcLanguageChooser *chooser,
                         gboolean is_extra;
 
                         gtk_widget_set_opacity (check, 1.0);
+                        gtk_widget_set_sensitive (chooser->done_button, TRUE);
 
                         /* make sure the selected language is shown */
                         is_extra = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (row), "is-extra"));
diff --git a/panels/common/cc-language-chooser.ui b/panels/common/cc-language-chooser.ui
index 2c351e9ba..b9e735419 100644
--- a/panels/common/cc-language-chooser.ui
+++ b/panels/common/cc-language-chooser.ui
@@ -10,6 +10,7 @@
       <object class="GtkButton" id="done_button">
         <property name="label" translatable="yes">_Done</property>
         <property name="visible">True</property>
+        <property name="sensitive">False</property>
         <property name="can_focus">True</property>
         <property name="can_default">True</property>
         <property name="receives_default">True</property>