bug #136 Revert "Remove performNoDeepMerging to authorise additional …

…custom theme folders" (GSadee)

This PR was merged into the 2.4 branch.

Discussion
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Reverts #128

I did not notice that in the PR the tests were not included and this actually changes the expected behaviour. This change has been explained in the PR, but I still have some doubts and IMO it should be further investigated how the Theme Bundle will behave in the case of the several directories specified.

Commits
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69100dc Revert "Remove performNoDeepMerging to authorise additional custom theme folders"

src/Configuration/Filesystem/FilesystemConfigurationSourceFactory.php

@@ -45,6 +45,7 @@ public function buildConfiguration(ArrayNodeDefinition $node): void
             ->arrayNode('directories')
                 ->defaultValue(['%kernel.project_dir%/themes'])
                 ->requiresAtLeastOneElement()
+                ->performNoDeepMerging()
                 ->prototype('scalar')
         ;
     }