TYPO3 Core

After installing/removing an extension using the icon in the Ext-list, EM redirects to the same page again:

header('Location: '.t3lib_div::linkThisScript($vA));

Unfortunately there's no call to exit afterwards, but the whole page is rendered again (but, of course, this content is ignored by the browser).
No other useful things are done - so let's exit immediately

Rendering the page already, but not displaying it, prevents session-stored flashmessages to render (example: (this bug's number)+1).
They are renderded and removed - but not shown to the user ;-)
(issue imported from #M12186)