[folks] Don't synchronise alias between Personas

[Travis Reitter <treitter src gnome org>]

commit 9004ea1a98f6deed6fd363a051467cd93fdf9560
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Mon Aug 9 17:08:43 2010 +0100

    Don't synchronise alias between Personas
    
    When setting a new alias on an Individual, only push it to Personas from
    the writeable PersonaStore. This prevents every other Persona's alias from
    being unnecessarily overwritten.

 folks/individual.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/folks/individual.vala b/folks/individual.vala
index 49bbcc9..09bd864 100644
--- a/folks/individual.vala
+++ b/folks/individual.vala
@@ -91,7 +91,7 @@ public class Folks.Individual : Object,
           this._alias = value;
           this._personas.foreach ((p) =>
             {
-              if (p is Alias)
+              if (p is Alias && ((Persona) p).store.is_writeable == true)
                 ((Alias) p).alias = value;
             });
         }