Plugin editor files list is inconsistent

[mark8barnes]

The plug-in editor files list inconsistently handles folders. The file list includes all the files in same folder as the file currently being edited, plus files in any subfolders, but only to one level deep. This means the file list changes, according to which files you are editing. When you're editing a file in a sub-folder, files higher up the hiearchy disappear, and new files from deeper levels are added. This is confusing behaviour.

Either (a) proper folder navigation should be added, or
(b) All plug-in files should be included in the list at all times.

[scribu]

(a) would be preferable, considering plugins are getting more and more complex.

[solarissmoke]

There are a bunch of tickets that already address this: #6531, #10429, #14175