Add warning when duplicate page Template Names are present

[johncoswell]

Currently, there's no way without searching through every template file whether or not you have a duplicate Template Name (from, say, copying a page template file to another one). It would be nice to have a warning in the Page Template selection area that you have duplicate Template Names in certain files, and to direct you to repair that error before you proceed with setting Page Templates.

[RDall]

While I do like this idea aren't most themes are produced by people with FTP/SSH access. Wouldn't they see the template names in the list of templates file before they went into set the template in the page editor.

We would also give the user control to change file names which might be too much control for the user IMHO.

[terminalpixel]

Replying to RDall:

They would see the PHP file names not the template name which is included in a comment in a file.

But I agree this would mainly be for developers so perhaps it could check for WP_DEBUG being set.

While I do like this idea aren't most themes are produced by people with FTP/SSH access. Wouldn't they see the template names in the list of templates file before they went into set the template in the page editor.

We would also give the user control to change file names which might be too much control for the user IMHO.

[obenland]

This sounds like an edge case situation, the overwhelming majority of themes probably doesn't have more than a handful of page templates, if any.

I'd consider it plugin territory since it's a debug notification used during development, and not intended for users. Maybe it could be part of ​Theme Check.