TYPO3 Core

Extension's script class.ext_update.php are used to update data when newly installing an extension or upgrading an existing one.

Unfortunately class.ext_update.php is even executed if the extension isn't loaded at all. This is unneccessary and most probably causes an error as class.ext_update.php in most cases will use the extension's API and therefore depend that extension is loaded.

• import an extension that provides such a class (but don't install it)
• switch to EM function "Install extensions"
• click on the extension's name to see details
• then class.ext_update.php is executed!

(issue imported from #M9977)