Extend the WP.org API's `query_themes` action to allow passing multiple theme slugs

[Bernhard Reiter]

Right now, it's possible to pass a single theme slug to query_themes to obtain data for that theme, e.g. GET ​https://api.wordpress.org/themes/info/1.1/?action=query_themes&request%5Btheme%5D=twentyfourteen

I propose extending the API so I can pass in multiple theme slugs and obtain the corresponding list of theme info objects.

E.g. like this: ​https://api.wordpress.org/themes/info/1.1/?action=query_themes&request%5Btheme%5D=twentyfourteen&request%5Btheme%5D=twentyfifteen

(Right now, that returns data for Twenty Fifteen only.)

My use case is a scenario where I already have a list of themes (say, locally installed in a WP install) for which I'd like to fetch additional information from WP.org in one sweep.

[dd32]

This has been supported for the last two years through #1304

eg:
​https://api.wordpress.org/themes/info/1.2/?action=theme_information&request%5Bslugs%5D=twentyfourteen,twentyfifteen