Bug 1463132 - New autofill threshold doesn't work well with redirects. r=adw

MozReview-Commit-ID: 9DqCWA2nGnz

docshell/base/nsDocShell.cpp

@@ -12610,6 +12610,9 @@ nsDocShell::AddURIVisit(nsIURI* aURI,
 
     if (aResponseStatus >= 300 && aResponseStatus < 400) {
       visitURIFlags |= IHistory::REDIRECT_SOURCE;
+      if (aResponseStatus == 301 || aResponseStatus == 308) {
+        visitURIFlags |= IHistory::REDIRECT_SOURCE_PERMANENT;
+      }
     }
     // Errors 400-501 and 505 are considered unrecoverable, in the sense a
     // simple retry attempt by the user is unlikely to solve them.