Filter for get_editor_stylesheets()

[danielbachhuber]

I'd like to be able to pre-process registered editor stylesheets to append filemtime for automatic cache busting. Yes, I can muck with the global but this is the most exact way to do it.

Related #30187

[valendesigns]

Needs a filter docblock.

[valendesigns]

Thanks for the quick response! One thing to note is that filter docs are typically in the "Filter X for X" syntax. Maybe something like "Filter the array of stylesheets applied to the editor.", or similar would be more applicable in this situation?

[DrewAPicture]

The hook docs look OK, other than needing to update the @since version to 4.3.0, @mikehandsenme.

[MikeHansenMe]

updated @since to 4.3.0

[MikeHansenMe]

31672.4.diff​ is updated to show @since 4.3.0

[DrewAPicture]

Hook docs in 31672.4.diff​ look good.

[SergeyBiryukov]

In 32928:

Add editor_stylesheets filter to get_editor_stylesheets().

props danielbachhuber, MikeHansenMe.
fixes #31672.