index: use git commit times on missing Date/Received

When indexing messages without Date: and/or Received: headers,
fall back to using timestamps originally recorded by git in the
commit object.  This allows git mirrors to preserve the import
datestamp and timestamp of a message according to what was fed
into git, instead of blindly falling back to the current time.

1 files changed, 1 insertions, 0 deletions

diff --git a/MANIFEST b/MANIFEST
index 265ad909..f9230cd3 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -242,6 +242,7 @@ t/httpd.t
 t/hval.t
 t/import.t
 t/inbox.t
+t/index-git-times.t
 t/indexlevels-mirror-v1.t
 t/indexlevels-mirror.t
 t/init.t