Add Open in Editor support for template paths

[federicobond]

Description

This adds a setting to configure an Open in editor URL when you click on a template path. Makes it easier to jump directly to the template and edit. Can develop it further and/or add tests if there is interest in the feature.

Checklist:

• I have added the relevant tests for this change.
• I have added an item to the Pending section of docs/changes.rst.

[tim-schilling]

I wonder if it's possible to detect that the project is running in vscode and we could avoid the setting altogether?

[tim-schilling]

Ah, that's a good reference. I like the idea of having a magic-ish value/constant to specify rather than asking them to write in a lambda for a setting.

[federicobond]

@tim-schilling updated to use a constant to specify the editor URL format.

Test failures appear unrelated.

[tim-schilling]

This is looking good. Marking it as Request Changes to ask for the tests. I think tests that cover get_editor_url and the new get_stats() of TemplatesPanel would be great.

The other stretch thing would be to add is a reference to the new setting in the TemplatesPanel documentation.

[federicobond]

I just added the requested tests and updated the docs format.

I would prefer to hold off with documenting this as something that's mostly useful for the requests panel because I believe it's going to be useful in other places too (like stacktraces).

[tim-schilling]

That's fair about mentioning the editor setting the templates panel documentation. I think we do want to have this mentioned in the changes.rst file so folks get alerted to the change in the next release.

[federicobond]

Done!