Bug 475542 - history/cache problem with view page source issuing a GET on an already POSTed form. r=gavin

toolkit/components/viewsource/content/viewSource.js

@@ -232,10 +232,12 @@ function viewSource(url)
           loadFromURL = false;
 
           // Record the page load in the session history so <back> will work.
+          var shEntrySource = arg.QueryInterface(Ci.nsISHEntry);
           var shEntry = Cc["@mozilla.org/browser/session-history-entry;1"].createInstance(Ci.nsISHEntry);
           shEntry.setURI(makeURI(viewSrcUrl, null, null));
           shEntry.setTitle(viewSrcUrl);
           shEntry.loadType = Ci.nsIDocShellLoadInfo.loadHistory;
+          shEntry.cacheKey = shEntrySource.cacheKey;
           getBrowser().webNavigation.sessionHistory
                       .QueryInterface(Ci.nsISHistoryInternal)
                       .addEntry(shEntry, true);