Amount doesn't appear on Pay Later receipt

The amount is missing from the receipt.

The reason is that the code for CRM_Contribute_BAO_Contribution_Utils::processConfirm() has the amount passed into it as $form->_params['amount'] but when it calls CRM_Contribute_BAO_ContributionPage::sendMail() on line 212 it passes it $form->_values.

What is needed is to copy $form->_params['amount'] to $form->_values['amount'] if the form doesn't have that value set.