TinyMCE fields look for skins in the wrong place

[petertwise]

Issue Overview

What's specifically breaking ACF's WYSIWYG editor for me is that Gutenberg is looking for CSS files in /wp-content/plugins/gutenberg/vendor/skins

If I copy /wp-includes/js/tinymce/skins/* to /wp-content/plugins/gutenberg/vendor/skins it fixes the issue.

Can we get Gutenberg to look for those CSS files in the core tinymce skins directory or include the skins in the place where Gutenberg is looking for them?

I realize #3840 is still open for various reasons, but this seems to address the TinyMCE js files and not the CSS styles that are required.

Steps to Reproduce (for bugs)

WordPress 4.9.4
Gutenberg 2.3.0
ACF Pro 5.6.9

• Add an ACF WYSIWYG field
• go to the Gutenberg version of the edit or add page screen
• TinyMCE editor in the meta box breaks due to 404 on /wp-content/plugins/gutenberg/vendor/skins/lightgray/skin.min.css and /plugins/gutenberg/vendor/skins/lightgray/content.min.css

Possible Solutions

A. Get TinyMCE's version that is loaded by Gutenberg to look for those files where they exist already in core: /wp-includes/js/tinymce/skins/
B. Add the CSS files to the Gutenberg vendors directory /plugins/gutenberg/vendor/skins

Screenshots / Video

https://www.dropbox.com/s/55y2tntp935dkt4/Screenshot%202018-03-08%2021.24.44.png?dl=0

Related Issues and/or PRs

#3731
#3840

[youknowriad]

closed by #6848