Add a new template-editing tag to the Theme API

[poena]

With the template editing being a new feature in 5.8 that is opt-in,
a new tag should be added so that users can filter and search for themes that support it.

Suggest tag: template-editing
Label: Template editing
Description: Support template editing in the block editor

[desrosj]

Just to clarify, this request is to add the Template Editing feature to this screen?

I don't think anything would prevent a theme author from adding that tag to their theme's header as I can't find any code that validates the list of tags for a theme.

I'm also not sure if a corresponding meta ticket would be needed to return that tag in the API results. I'd need to do some testing.

[SergeyBiryukov]

The corresponding Meta ticket is ​#meta5802.

Core keeps its own list of these tags in get_theme_feature_list(), so we can add the new one there as well.

Related: #50164, #50165.

[poena]

Yes that is correct, I am suggesting that template editing is added to the feature list.

When a theme is submitted, ​it goes through an automated check to see if it is using the correct tags.
Until two weeks ago, this check did block themes that had incorrect tags.

[desrosj]

53556.diff​ adds a @since tag to note when Template Editing was added as a feature.

I've marked as i8n-change as the Polyglot team would need to be made aware of this change should it be backported to 5.8.1. I think it makes sense to include it, but the ​#meta5802 ticket should ideally land at the same time.

Marking commit so that @SergeyBiryukov can shepherd both of these in within a reasonable amount of time of each other.

[SergeyBiryukov]

In 51510:

Themes: Add "Template Editing" to the list of WordPress theme features.

Follow-up to ​[meta11158].

Props poena, desrosj.
Fixes #53556. See ​#meta5802.

[SergeyBiryukov]

Reopening for backporting to the 5.8 branch.

[desrosj]

In 51516:

Themes: Add "Template Editing" to the list of WordPress theme features.

Follow-up to ​[meta11158].

Props poena, desrosj, SergeyBiryukov.
Merges [51510] to the 5.8 branch.
Fixes #53556. See ​#meta5802.

[arnoldus3ma]

Replying to poena:

With the template editing being a new feature in 5.8 that is opt-in,
a new tag should be added so that users can filter and search for themes that support it.

Suggest tag: template-editing
Label: Template editing
Description: Support template editing in the block editor