Bug #193317 --> 100% CPU viewing news w/ a background image. Fix this by not implementing SetOriginalURI. This was

confusing image lib which reloads the image if the current url on the channel does not match the original URI on the channel. 

IMAP does not implement this method either.

r/sr=bienvenu

mailnews/news/src/nsNNTPProtocol.cpp

@@ -756,7 +756,22 @@ nsNntpCacheStreamListener::OnDataAvailable(nsIRequest *request, nsISupports * aC
     nsCOMPtr <nsIRequest> ourRequest = do_QueryInterface(mChannelToUse);
     return mListener->OnDataAvailable(ourRequest, aCtxt, aInStream, aSourceOffset, aCount);
 }
-
+
+NS_IMETHODIMP nsNNTPProtocol::GetOriginalURI(nsIURI* *aURI)
+{
+    // News does not seem to have the notion of an original URI (See Bug #193317)
+    // *aURI = m_originalUrl ? m_originalUrl : m_url;
+    *aURI = m_url;
+    NS_IF_ADDREF(*aURI);
+    return NS_OK; 
+}
+ 
+NS_IMETHODIMP nsNNTPProtocol::SetOriginalURI(nsIURI* aURI)
+{
+    // News does not seem to have the notion of an original URI (See Bug #193317)
+    return NS_OK;       // ignore
+}
+ 
 nsresult nsNNTPProtocol::SetupPartExtractorListener(nsIStreamListener * aConsumer)
 {
   PRBool convertData;

mailnews/news/src/nsNNTPProtocol.h

@@ -183,7 +183,10 @@ public:
   
   NS_IMETHOD Cancel(nsresult status);  // handle stop button
   NS_IMETHOD GetContentType(nsACString &aContentType);
-  NS_IMETHOD AsyncOpen(nsIStreamListener *listener, nsISupports *ctxt);
+  NS_IMETHOD AsyncOpen(nsIStreamListener *listener, nsISupports *ctxt);
+  NS_IMETHOD GetOriginalURI(nsIURI* *aURI);
+  NS_IMETHOD SetOriginalURI(nsIURI* aURI);
+
   nsresult LoadUrl(nsIURI * aURL, nsISupports * aConsumer);
 
 private: