Add bundle with delay and retry

As discussed in SL#4841, when installing activities via system
packages there is no guarantee that diretory contents are available
yet even if the GFileMonitor has detected the directory creation.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Signed-off-by: James Cameron <quozl@laptop.org>

src/jarabe/model/bundleregistry.py

@@ -137,10 +137,18 @@ def __desktop_view_icons_changed_cb(self, model):
     def __file_monitor_changed_cb(self, monitor, one_file, other_file,
                                   event_type):
         if event_type == Gio.FileMonitorEvent.CREATED:
-            self.add_bundle(one_file.get_path(), set_favorite=True)
+            # XXX SL4841 we can't guarantee the contents are all set yet
+            GLib.timeout_add(100, self.__timeout_add_cb, one_file.get_path())
         elif event_type == Gio.FileMonitorEvent.DELETED:
             self.remove_bundle(one_file.get_path())
 
+    def __timeout_add_cb(self, bundle_path):
+        try:
+            self.add_bundle(bundle_path, set_favorite=True)
+            return False
+        except:
+            return True
+
     def _load_mime_defaults(self):
         defaults = {}