TYPO3 Core

Title is wrong, is was TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin and not the registerPlugin function

FYI: Gridelements does not use addTypoScript at all, but uses addStaticFile instead.

I think the difference is, that you have to include the static file then, while addTypoScript would insert the TS-code directly.

Adding a line to add it to the static typoscript FILE will work:

$GLOBALS['TYPO3_CONF_VARS']['FE']['defaultTypoScript_' . $type . '.']['cssstyledcontent/static/v4.6/'] .= $content;

That's not a fix, but workaround where you've to change the core.

I try to figure out what's the problem.

A better way, working for me, is to edit em_conf of your extension and add css_styled_content as depends.

Hope the bug will be solved soon, so we don't have to add the core extension as dependency.

No sorry. I went on to other issues.

As mentioned in slack, my opinion would be to add css_styled_content as suggested into ext_emconf of extbase. As css_styled_content is just one way to display content of TYPO3, and extbase supports this way, it is no dependency.
We just need to take care, whether PackageStates.php will follow the suggestions as it follows the dependencies.

This issue can be closed :)