[gdm] slave: Add back setting of session-id

[Jasper St. Pierre <jstpierre src gnome org>]

commit 9539d0763f13dc9431ac014d80023e0c0109683e
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Feb 13 09:46:17 2014 -0500

    slave: Add back setting of session-id
    
    It turns out this *is* used, after all...

 daemon/gdm-slave.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-slave.c b/daemon/gdm-slave.c
index d225053..a4a4095 100644
--- a/daemon/gdm-slave.c
+++ b/daemon/gdm-slave.c
@@ -1694,6 +1694,14 @@ gdm_slave_switch_to_user_session (GdmSlave   *slave,
 }
 
 static void
+_gdm_slave_set_session_id (GdmSlave   *slave,
+                           const char *id)
+{
+        g_free (slave->priv->session_id);
+        slave->priv->session_id = g_strdup (id);
+}
+
+static void
 _gdm_slave_set_display_id (GdmSlave   *slave,
                            const char *id)
 {
@@ -1712,6 +1720,9 @@ gdm_slave_set_property (GObject      *object,
         self = GDM_SLAVE (object);
 
         switch (prop_id) {
+        case PROP_SESSION_ID:
+                _gdm_slave_set_session_id (self, g_value_get_string (value));
+                break;
         case PROP_DISPLAY_ID:
                 _gdm_slave_set_display_id (self, g_value_get_string (value));
                 break;
@@ -1939,7 +1950,7 @@ gdm_slave_class_init (GdmSlaveClass *klass)
                                                               "Session id",
                                                               "ID of session",
                                                               NULL,
-                                                              G_PARAM_READABLE));
+                                                              G_PARAM_READWRITE));
         g_object_class_install_property (object_class,
                                          PROP_DISPLAY_ID,
                                          g_param_spec_string ("display-id",