From cc6191863f97a3995e7c616b539631c205350e89 Mon Sep 17 00:00:00 2001
From: Simon McVittie <simon.mcvittie@collabora.co.uk>
Date: Thu, 30 Aug 2007 10:04:00 +0000
Subject: When an activity becomes valid, emit the "missing" BuddyJoined signals; when it becomes invalid, emit BuddyLeft signals for everyone in it

---
diff --git a/src/activity.py b/src/activity.py
index e85d314..71f2b2d 100644
--- a/src/activity.py
+++ b/src/activity.py
@@ -276,13 +276,23 @@ class Activity(ExportedGObject):
         """
         try:
             old_valid = self._valid
-            if self._color and self._actname and self._id and self._type:
+            if (self._color is not None and self._actname is not None
+                and self._id is not None and self._type is not None):
                 self._valid = True
             else:
                 self._valid = False
 
             if old_valid != self._valid:
                 self.emit("validity-changed", self._valid)
+                if self._valid:
+                    # Pretend everyone joined
+                    for buddy in self._buddies:
+                        self.BuddyJoined(buddy.object_path())
+                else:
+                    # Pretend everyone left
+                    for buddy in self._buddies:
+                        self.BuddyLeft(buddy.object_path())
+
         except AttributeError:
             self._valid = False
 
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