Parent Theme Editor styles should be included before Child Theme styles

[dd32]

Related: #14430 (and originally reported by somatic in #14430#comment:11 )

#14430 fixed the order of inclusion for css styles of the same name so that child theme styles could override the parents.

However, That only applied to stylesheers of the same name.

Consider:

child theme:
add_action( 'after_setup_theme', function() {
add_editor_style( 'child-style.css');
} );

parent theme:
add_action( 'after_setup_theme', function() {
add_editor_style( 'editor-style.css');
} );

Since they're not the same name, they'll be included in the order they were defined:

content_css:"
http://mysite.com/wp-content/themes/my-child-theme/child-style.css,
http://mysite.com/wp-content/themes/twentyeleven/editor-style.css"

Instead of looping over $editor_styles and adding the files as they're found, Perhaps the files should be sought after in the parent theme, and then a 2nd loop be run to find them all in the child themes folder.

[dd32]

In [18572]:

Load all Parent theme stylesheets before Child theme stylesheets in the TinyMCE Editor. props SergeyBiryukov. Fixes #18457