Can't rename file with template manager

[brianteeman]

Steps to reproduce the issue

Go to the template manager and select one of the templates
On the toolbar select new file and create a new file eg brian.php
Now select the newly created file and on the toolbar select rename file and try to give it a new name eg simon.php

Expected result

File is renamed to simon.php

Actual result

Invalid file name. Please choose a file name containing a-z, A-Z, 0-9, - and _.

System information (as much as possible)

Tested on 3.6.2 and current staging

[C-Lodder]

This is because you need to type in the file name only, not the extension too (.php in this case). If you simply type in "simon", it will work.

I'll submit a PR for this

[brianteeman]

Good spot - closing