[kupfer] core: Use weakref in PeriodicRescanner

[Ulrik Sverdrup <usverdrup src gnome org>]

commit e9f739592006cff15ef9cc9b178d9ef443e9803b
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Sun May 9 16:25:25 2010 +0100

    core: Use weakref in PeriodicRescanner

 kupfer/core/sources.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/kupfer/core/sources.py b/kupfer/core/sources.py
index e734901..021c579 100644
--- a/kupfer/core/sources.py
+++ b/kupfer/core/sources.py
@@ -30,7 +30,7 @@ class PeriodicRescanner (pretty.OutputMixin):
 		self.campaign=campaign
 		self.timer = scheduler.Timer()
 		# Source -> time mapping
-		self.latest_rescan_time = {}
+		self.latest_rescan_time = weakref.WeakKeyDictionary()
 		self._min_rescan_interval = campaign//4
 
 	def set_catalog(self, catalog):