acf-tinydns: Editing an existing NAPTR record can delete the domain field
Scenario:
Editing a file called 2.5.2.enum.example.net, with the following NAPTR record:
N1.2.5.2.enum.example.net:10:100:u:E2U+sip:sip\072200@10.97.80.4!::300:
When clicking on the wrench symbol to edit the record, the domain field displays 1 in the text box, then .2.5.2.enum.example.net. If the 1 is removed, then the zone file is saved, the resulting record is created in the zone file:
N:10:100:u:E2U+sip:sip\072200@10.97.80.4!::300:
The expected record is:
N2.5.2.enum.example.net:10:100:u:E2U+sip:sip\072200@10.97.80.4!::300:
(from redmine: issue id 3591, created on 2014-11-27, closed on 2015-06-26)