Fix for bug # 21567. Mail composer urls get in to SH. This is a regression from some of

the recent uriLoader changes. r=mscott, a=don


git-svn-id: svn://10.0.0.236/trunk@56419 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/docshell/base/nsWebShell.cpp

@@ -1959,7 +1959,7 @@ nsWebShell::LoadURL(const PRUnichar *aURLSpec,
    SetHistoryState(aHistoryState);
 
   /* Add the page to session history */
-  if (aModifyHistory && shist)  {
+  if (aModifyHistory && shist && (!isMail))  {
         PRInt32  ret;
         ret = shist->Add(spec, this);
   }