add_editor_style() should support plugins as well

[ericlewis]

Although plugins can use the "mce_css" filter to add stylesheets for TinyMCE, from an API standpoint this function is a bit misleading / counterintuitive. Why shouldn't plugins be allowed to use one and the same function call to load stylesheets? I know this was probably implemented for use in twentyten, but maybe it's time to expand it.

Frankly I still don't see a point in having add_editor_style() at all. The whole functionality (wouldn't call it API) of add_editor_style(), the $editor_styles global and the code block in wp_editor that parses it was added with the assumption that theme authors don't know how to use filters.

However plugin authors know how to use filters, so using 'mce_css' is far better.

Replying to azaozz:

Frankly I still don't see a point in having add_editor_style() at all. The whole functionality (wouldn't call it API) of add_editor_style(), the $editor_styles global and the code block in wp_editor that parses it was added with the assumption that theme authors don't know how to use filters.

However plugin authors know how to use filters, so using 'mce_css' is far better.

-1 to that.

Developers may know how to use filters, but developers are really no better at finding filters that are named obscurely. 'mce_css' is probably one of the worst named hooks in WordPress in you care anything about making hook discovery easier.