[gnome-software] Don't allow a manual updates refresh when offline

[Richard Hughes <rhughes src gnome org>]

commit c792df59f339ec3f06c3f20fbcf23ed183ed4453
Author: Richard Hughes <richard hughsie com>
Date:   Sun Nov 27 21:27:31 2016 +0000

    Don't allow a manual updates refresh when offline

 src/gs-shell-updates.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-shell-updates.c b/src/gs-shell-updates.c
index 6d2f47b..46f844e 100644
--- a/src/gs-shell-updates.c
+++ b/src/gs-shell-updates.c
@@ -324,6 +324,8 @@ gs_shell_updates_update_ui_state (GsShellUpdates *self)
                }
                break;
        }
+       gtk_widget_set_sensitive (self->button_refresh,
+                                 gs_plugin_loader_get_network_available (self->plugin_loader));
 
        /* headerbar update button */
        gtk_widget_set_visible (self->button_update_all,