TinyMCE (WYSIWYG) doesn't work in admin when JS minify is enabled

[jordy2607]

Preconditions

1. Magento 2.1.9 production mode

Steps to reproduce

1. Enable js minify in Stores->Advanced->Developer
2. Deploy static content
3. Open an admin page with a textarea with TinyMCE editor enabled. For example a product edit page and open the content tab for the TinyMCE to load.

Expected result

1. TinyMCE is loaded succesfully

Actual result

1. TinyMCE is trying to load its dependencies but the url from which it is trying to retrieve these dependencies is incorrect. Which causes TinyMCE failing to load.
2. Expected url: /static/adminhtml/Magento/backend/en_US/tiny_mce/plugins/inlinepopups/editor_plugin_src.js
3. Actual url: /storemanager/catalog/product/edit/id/324/key/fbd61981481baeb3aa25d2fbae2c1fc6e715ab6ea8806793343d4343f79fa0fd//plugins/inlinepopups/editor_plugin.js

[magento-engcom-team]

@jordy2607 We cannot reproduce this issue as described. Please add more details to your description of the steps you followed when identifying this issue. Screenshots or logs would be helpful, too.

[piotrkwiecinski]

I have similar problem on 2.1.7. Requirement is to have production mode and minification enabled. For me it happens when I have 2 plugins enabled Dotmailer and Adyen Payment.

I'm trying to narrow it down, but it takes a while due to need to redeploy static content.

[fjmrf]

We have the same issue on a client's installation. Magento 2.1.7, production mode and minification enabled. We deactivated the minification and worked, so the issue is when minified. We still don't have a fix. One more detail, the server set up seems to have influence on it: the issue happens on the production server but not on the stage server. Attached a video of the issue.
2017-11-02_15-07-01.mp4.zip

I have the same issue with two different Magento 2.2.0 sites.

Issue only seems to occur when the Minify JavaScript Files option is enabled.

Example of an incorrect path;
/admin/catalog/product/edit/id/41056/key/1ae172c797df98a63ac5f4de3dbfcfef776d78ef715de001002671cc43026641//plugins/paste/editor_plugin.js

[mipsvikas]

This is the problem due to after turn on JS minify option the static file path is incorrect as well as all plugn js are minimize in .min.js form but in script name it not with .min version.

I have fixed issue by modify in lib/web/tiny_mce/tiny_mce_src.js

1-Find code near line 10833
tinymce.documentBaseURL = window.location.href.replace(/[\?#].*$/, '').replace(/[\/\\][^\/]+$/, '');
if (!/[\/\\]$/.test(tinymce.documentBaseURL))
tinymce.documentBaseURL += '/';

Replace with
tinymce.documentBaseURL = ADMIN_BASE_URL+"/tiny_mce";
tinymce.baseURL = ADMIN_BASE_URL+"/tiny_mce";
if(IS_MINIFY == 1) tinymce.suffix = '.min'; else tinymce.suffix = '';

2- Find code near line 11391
sl.add(tinymce.baseURL + '/langs/' + s.language + '.js');
Replace with
sl.add(tinymce.baseURL + '/langs/' + s.language + tinymce.suffix + '.js');
3- Find code near line 10758
tinymce.ScriptLoader.add(this.urls[n] + '/langs/' + s.language + '.js');
Replace with
tinymce.ScriptLoader.add(this.urls[n] + '/langs/' + s.language + tinymce.suffix + '.js');

Change code in bellow file or override in admin theme:
vendor/magento/module-backend/view/adminhtml/templates/page/js/require_js.phtml

4- Find code:

<script>
var BASE_URL = '<?php /* @escapeNotVerified */ echo $block->getUrl('*') ?>';
var FORM_KEY = '<?php /* @escapeNotVerified */ echo $block->getFormKey() ?>';
var require = {
"baseUrl": "<?php /* @escapeNotVerified */ echo $block->getViewFileUrl('/') ?>"
};
</script>
`
Replace code with:

<?php
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$scopeConfig = $objectManager->create('Magento\Framework\App\Config\ScopeConfigInterface');
$isMinify = $scopeConfig->getValue('dev/js/minify_files', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);
?>
<script>
var BASE_URL = '<?php /* @escapeNotVerified */ echo $block->getUrl('*') ?>';
var FORM_KEY = '<?php /* @escapeNotVerified */ echo $block->getFormKey() ?>';
var ADMIN_BASE_URL = '<?php /* @escapeNotVerified */ echo $block->getViewFileUrl('/') ?>';
var IS_MINIFY = '<?php /* @escapeNotVerified */ echo $isMinify ?>';
var require = {
"baseUrl": "<?php /* @escapeNotVerified */ echo $block->getViewFileUrl('/') ?>"
};
</script>

5- Run commands
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploye

Now working fine