add_editor_style() in child theme not working for editor_style.css

[richardwo]

created a child theme of twentyeleven
functions.php contains add_editor_style();
editor-style.css in the theme folder.
This file is not picked up by TinyMCE (confirmed by looking at tinyMCEPreInit in source).

Changing the name of the css file to e.g. child-editor-style.css and using add_editor_style( 'child-editor-style.css' );
works fine.

In [20059], the line was introduced to prevent a stylesheet from loading by a parent theme if a file with the same name was already loaded by a child theme:

$editor_styles[$key] = '';

In [20342], this behaviour was reversed (comment:ticket:19437:14).

Not sure if the line was necessary in the first place. Moving to 3.4.1, as it's technically a regression.

The patch works as expected. For child themes it will be testing up to four locations for each file added to the $editor_styles global, two for .css and two for -rtl.css.

In [21114]:

Allow add_editor_style() to load a child theme's editor style when the parent theme's style exists for the same filename. props SergeyBiryukov. see #21026 for trunk.

In [21123]:

Allow add_editor_style() to load a child theme's editor style when the parent theme's style exists for the same filename. props SergeyBiryukov. fixes #21026 for 3.4.