apt.cache.FilteredCache: Fix multi-arch package lookups

This makes it slightly slower, but everyone should be happier.

1 files changed, 6 insertions, 2 deletions

diff --git a/apt/cache.py b/apt/cache.py
index d6d187c3..73a95e7c 100644
--- a/apt/cache.py
+++ b/apt/cache.py
@@ -694,10 +694,14 @@ class FilteredCache(object):
         return self._filtered.keys()
 
     def has_key(self, key):
-        return (key in self._filtered)
+        return key in self
 
     def __contains__(self, key):
-        return (key in self._filtered)
+        try:
+            # Normalize package name for multi arch
+            return self.cache[key].name in self._filtered
+        except KeyError:
+            return False
 
     def _reapply_filter(self):
         " internal helper to refilter "