series: Update the number of patches when resending full new series

I can't believe it took 3 tries to properly test this. When resending
a full series, we actually want to update n_patches of the new revision
we are creating, because the new series can have any number of patches.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

patchwork/bin/parsemail.py

@@ -673,6 +673,7 @@ def on_revision_complete(sender, revision, **kwargs):
     new_revision = previous_series.latest_revision().duplicate_meta()
     new_revision.root_msgid = revision.root_msgid
     new_revision.cover_letter = revision.cover_letter
+    new_revision.n_patches = revision.n_patches
     new_revision.save()
     i = 1
     for patch in revision.ordered_patches():

patchwork/tests/test_series.py

@@ -556,6 +556,7 @@ def check_revision(self, series, revision, mails, ref_n_patches):
         self.assertEquals(revision.series_id, series.id)
         self.assertEquals(revision.root_msgid, mails[0].get('Message-Id'))
         self.assertEquals(revision.patches.count(), n_patches)
+        self.assertEquals(revision.n_patches, n_patches)
 
         i = 1 if self.has_cover_letter else 0
         for patch in revision.ordered_patches():