[polari] room: Make :channel contruct-only

[Florian Müllner <fmuellner src gnome org>]

commit 5c60f9bae9d8543045069bedb57c0640f4e2cb3d
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jul 25 18:50:51 2013 +0200

    room: Make :channel contruct-only
    
    The channel might get invalidated, but never change. Reflecting that
    will allow for some simplifications regarding changes.

 src/lib/polari-room.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/lib/polari-room.c b/src/lib/polari-room.c
index 4f5fc14..ae050f9 100644
--- a/src/lib/polari-room.c
+++ b/src/lib/polari-room.c
@@ -498,7 +498,7 @@ polari_room_class_init (PolariRoomClass *klass)
                          "Channel",
                          "Channel",
                          TP_TYPE_CHANNEL,
-                         G_PARAM_READWRITE);
+                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
 
   g_object_class_install_properties (object_class, LAST_PROP, props);