[folks] Distinguish Telepathy errors with new UNSUPPORTED_ON_NON_USER

[Travis Reitter <treitter src gnome org>]

commit a91dd88b08997bef53593fed7c40441c05580478
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Mon Oct 10 11:07:01 2011 -0700

    Distinguish Telepathy errors with new UNSUPPORTED_ON_NON_USER

 NEWS                                          |    1 +
 backends/telepathy/lib/tpf-persona-store.vala |    2 +-
 folks/persona-store.vala                      |    8 ++++++++
 3 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index c0d5756..79cdc36 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,7 @@ API changes:
 * Implement EmailDetails on Tpf.Persona
 * Implement UrlDetails on Tpf.Persona
 * Implement BirthdayDetails on Tpf.Persona
+* Add PersonaStoreError.UNSUPPORTED_ON_NON_USER
 
 Overview of changes from libfolks 0.6.3.1 to libfolks 0.6.3.2
 =============================================================
diff --git a/backends/telepathy/lib/tpf-persona-store.vala b/backends/telepathy/lib/tpf-persona-store.vala
index 9dec990..560e402 100644
--- a/backends/telepathy/lib/tpf-persona-store.vala
+++ b/backends/telepathy/lib/tpf-persona-store.vala
@@ -2250,7 +2250,7 @@ public class Tpf.PersonaStore : Folks.PersonaStore
     {
       if (!persona.is_user)
         {
-          throw new PersonaStoreError.INVALID_ARGUMENT (
+          throw new PersonaStoreError.UNSUPPORTED_ON_NON_USER (
               _("Extended information may only be set on the user's Telepathy contact."));
         }
 
diff --git a/folks/persona-store.vala b/folks/persona-store.vala
index aa533c1..3b4c3e0 100644
--- a/folks/persona-store.vala
+++ b/folks/persona-store.vala
@@ -115,6 +115,14 @@ public errordomain Folks.PersonaStoreError
    * @since 0.6.0
    */
   REMOVE_FAILED,
+
+  /**
+   * Such an operation may only be performed on a { link Persona} with
+   * { link Persona.is_user} set to `true`.
+   *
+   * @since UNRELEASED
+   */
+  UNSUPPORTED_ON_NON_USER,
 }
 
 /**