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Description
In the CiviMail create/edit page, the template selector is missing in 4.7.30. I've tested on three sites upgraded to 4.7.30 (drupal/wp/joomla) and it's missing in all three. It appears to be due to this PR, which broke out the template selector into a separate subform:
https://github.com/civicrm/civicrm-core/commit/9b5049700825d6f334201c9d826ad322a8fa0302