Error message when Continue (or Reuse) on Find Mailings: doesn't remember the Group that was originally included.

Notice: Undefined index: Include in CRM_Mailing_Form_Group->setDefaultValues() (line 146 of /Applications/MAMP/htdocs/civicrm-buildkit/build/drupal-demo/sites/all/modules/civicrm/CRM/Mailing/Form/Group.php).

Tracked it to a Typo:
$defaults['includeGroups'] = $mailingGroups['civicrm_group']['Include'];
should be (lower case include):
$defaults['includeGroups'] = $mailingGroups['civicrm_group']['include'];