diff -r a10844a9914d -r a60f8b6b1d32 hgcacheproxymodel/src/hgbuffermanager.cpp
--- a/hgcacheproxymodel/src/hgbuffermanager.cpp	Fri Sep 17 15:55:58 2010 +0300
+++ b/hgcacheproxymodel/src/hgbuffermanager.cpp	Wed Oct 06 14:53:41 2010 +0300
@@ -317,4 +317,8 @@
     }
 }
 
+bool HgBufferManager::isCached(int idx) const
+{
+    return ((idx>=mBufferPosition) && (idx<mBufferPosition+mBufferSize));
+}
 //eof