[BUGFIX] Set „scanned“ flag when scanning all extensions

Resolves: #85504
Releases: master
Change-Id: I75580fb05c0217b1c28a2109b7f6bc2147d458d8
Reviewed-on: https://review.typo3.org/57494
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>

typo3/sysext/install/Resources/Public/JavaScript/Modules/ExtensionScanner.js

@@ -96,8 +96,10 @@ define(['jquery',
         .text('0%');
       self.setProgressForAll();
       $extensions.each(function() {
-        var extension = $(this).data('extension');
+        var $me = $(this);
+        var extension = $me.data('extension');
         self.scanSingleExtension(extension);
+        $me.data('scanned', true);
       });
     },